diff --git a/2023/baekjoon_1259/.vscode/settings.json b/2023/baekjoon_1259/.vscode/settings.json
new file mode 100644
index 0000000..7d30451
--- /dev/null
+++ b/2023/baekjoon_1259/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+ "dotnet.defaultSolution": "baekjoon_1259.sln"
+}
\ No newline at end of file
diff --git a/2023/baekjoon_1259/Program.cs b/2023/baekjoon_1259/Program.cs
new file mode 100644
index 0000000..98e13f2
--- /dev/null
+++ b/2023/baekjoon_1259/Program.cs
@@ -0,0 +1,34 @@
+namespace baekjoon_1259
+{
+ public class Palindrome
+ {
+ public bool IsPalindrome(string str)
+ {
+ int len = str.Length;
+ for (int i = 0; i < len / 2; i++)
+ {
+ if (str[i] != str[len - i - 1])
+ return false;
+ }
+ return true;
+ }
+ }
+
+ public class Program
+ {
+ public static void Main(string[] args)
+ {
+ Palindrome palindrome = new Palindrome();
+ while (true)
+ {
+ string str = System.Console.ReadLine();
+ if (str == "0")
+ break;
+ if (palindrome.IsPalindrome(str))
+ System.Console.WriteLine("yes");
+ else
+ System.Console.WriteLine("no");
+ }
+ }
+ }
+}
\ No newline at end of file
diff --git a/2023/baekjoon_1259/baekjoon_1259.csproj b/2023/baekjoon_1259/baekjoon_1259.csproj
new file mode 100644
index 0000000..f02677b
--- /dev/null
+++ b/2023/baekjoon_1259/baekjoon_1259.csproj
@@ -0,0 +1,10 @@
+
+
+
+ Exe
+ net7.0
+ enable
+ enable
+
+
+
diff --git a/2023/baekjoon_1259/baekjoon_1259.sln b/2023/baekjoon_1259/baekjoon_1259.sln
new file mode 100644
index 0000000..28d5ab5
--- /dev/null
+++ b/2023/baekjoon_1259/baekjoon_1259.sln
@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.002.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "baekjoon_1259", "baekjoon_1259.csproj", "{FD56C25D-13F3-4355-B1F8-818703D207BE}"
+EndProject
+Global
+ GlobalSection(SolutionConfigurationPlatforms) = preSolution
+ Debug|Any CPU = Debug|Any CPU
+ Release|Any CPU = Release|Any CPU
+ EndGlobalSection
+ GlobalSection(ProjectConfigurationPlatforms) = postSolution
+ {FD56C25D-13F3-4355-B1F8-818703D207BE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+ {FD56C25D-13F3-4355-B1F8-818703D207BE}.Debug|Any CPU.Build.0 = Debug|Any CPU
+ {FD56C25D-13F3-4355-B1F8-818703D207BE}.Release|Any CPU.ActiveCfg = Release|Any CPU
+ {FD56C25D-13F3-4355-B1F8-818703D207BE}.Release|Any CPU.Build.0 = Release|Any CPU
+ EndGlobalSection
+ GlobalSection(SolutionProperties) = preSolution
+ HideSolutionNode = FALSE
+ EndGlobalSection
+ GlobalSection(ExtensibilityGlobals) = postSolution
+ SolutionGuid = {142DF944-5A87-4AC4-A745-E54884B53AFA}
+ EndGlobalSection
+EndGlobal
diff --git a/2023/baekjoon_1259/bin/Debug/net7.0/baekjoon_1259.deps.json b/2023/baekjoon_1259/bin/Debug/net7.0/baekjoon_1259.deps.json
new file mode 100644
index 0000000..372e0b3
--- /dev/null
+++ b/2023/baekjoon_1259/bin/Debug/net7.0/baekjoon_1259.deps.json
@@ -0,0 +1,23 @@
+{
+ "runtimeTarget": {
+ "name": ".NETCoreApp,Version=v7.0",
+ "signature": ""
+ },
+ "compilationOptions": {},
+ "targets": {
+ ".NETCoreApp,Version=v7.0": {
+ "baekjoon_1259/1.0.0": {
+ "runtime": {
+ "baekjoon_1259.dll": {}
+ }
+ }
+ }
+ },
+ "libraries": {
+ "baekjoon_1259/1.0.0": {
+ "type": "project",
+ "serviceable": false,
+ "sha512": ""
+ }
+ }
+}
\ No newline at end of file
diff --git a/2023/baekjoon_1259/bin/Debug/net7.0/baekjoon_1259.dll b/2023/baekjoon_1259/bin/Debug/net7.0/baekjoon_1259.dll
new file mode 100644
index 0000000..f91861b
Binary files /dev/null and b/2023/baekjoon_1259/bin/Debug/net7.0/baekjoon_1259.dll differ
diff --git a/2023/baekjoon_1259/bin/Debug/net7.0/baekjoon_1259.exe b/2023/baekjoon_1259/bin/Debug/net7.0/baekjoon_1259.exe
new file mode 100644
index 0000000..1d5f9cc
Binary files /dev/null and b/2023/baekjoon_1259/bin/Debug/net7.0/baekjoon_1259.exe differ
diff --git a/2023/baekjoon_1259/bin/Debug/net7.0/baekjoon_1259.pdb b/2023/baekjoon_1259/bin/Debug/net7.0/baekjoon_1259.pdb
new file mode 100644
index 0000000..51f8ec0
Binary files /dev/null and b/2023/baekjoon_1259/bin/Debug/net7.0/baekjoon_1259.pdb differ
diff --git a/2023/baekjoon_1259/bin/Debug/net7.0/baekjoon_1259.runtimeconfig.json b/2023/baekjoon_1259/bin/Debug/net7.0/baekjoon_1259.runtimeconfig.json
new file mode 100644
index 0000000..184be8b
--- /dev/null
+++ b/2023/baekjoon_1259/bin/Debug/net7.0/baekjoon_1259.runtimeconfig.json
@@ -0,0 +1,9 @@
+{
+ "runtimeOptions": {
+ "tfm": "net7.0",
+ "framework": {
+ "name": "Microsoft.NETCore.App",
+ "version": "7.0.0"
+ }
+ }
+}
\ No newline at end of file
diff --git a/2023/baekjoon_1259/obj/Debug/net7.0/.NETCoreApp,Version=v7.0.AssemblyAttributes.cs b/2023/baekjoon_1259/obj/Debug/net7.0/.NETCoreApp,Version=v7.0.AssemblyAttributes.cs
new file mode 100644
index 0000000..4257f4b
--- /dev/null
+++ b/2023/baekjoon_1259/obj/Debug/net7.0/.NETCoreApp,Version=v7.0.AssemblyAttributes.cs
@@ -0,0 +1,4 @@
+//
+using System;
+using System.Reflection;
+[assembly: global::System.Runtime.Versioning.TargetFrameworkAttribute(".NETCoreApp,Version=v7.0", FrameworkDisplayName = ".NET 7.0")]
diff --git a/2023/baekjoon_1259/obj/Debug/net7.0/apphost.exe b/2023/baekjoon_1259/obj/Debug/net7.0/apphost.exe
new file mode 100644
index 0000000..1d5f9cc
Binary files /dev/null and b/2023/baekjoon_1259/obj/Debug/net7.0/apphost.exe differ
diff --git a/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.AssemblyInfo.cs b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.AssemblyInfo.cs
new file mode 100644
index 0000000..24fe7d7
--- /dev/null
+++ b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.AssemblyInfo.cs
@@ -0,0 +1,22 @@
+//------------------------------------------------------------------------------
+//
+// This code was generated by a tool.
+//
+// Changes to this file may cause incorrect behavior and will be lost if
+// the code is regenerated.
+//
+//------------------------------------------------------------------------------
+
+using System;
+using System.Reflection;
+
+[assembly: System.Reflection.AssemblyCompanyAttribute("baekjoon_1259")]
+[assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
+[assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0")]
+[assembly: System.Reflection.AssemblyProductAttribute("baekjoon_1259")]
+[assembly: System.Reflection.AssemblyTitleAttribute("baekjoon_1259")]
+[assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
+
+// MSBuild WriteCodeFragment 클래스에서 생성되었습니다.
+
diff --git a/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.AssemblyInfoInputs.cache b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.AssemblyInfoInputs.cache
new file mode 100644
index 0000000..fe3d6e7
--- /dev/null
+++ b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.AssemblyInfoInputs.cache
@@ -0,0 +1 @@
+8a4b1243282b92be04cf7ea0be9e172742604c29
diff --git a/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.GeneratedMSBuildEditorConfig.editorconfig b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.GeneratedMSBuildEditorConfig.editorconfig
new file mode 100644
index 0000000..7aed90e
--- /dev/null
+++ b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.GeneratedMSBuildEditorConfig.editorconfig
@@ -0,0 +1,11 @@
+is_global = true
+build_property.TargetFramework = net7.0
+build_property.TargetPlatformMinVersion =
+build_property.UsingMicrosoftNETSdkWeb =
+build_property.ProjectTypeGuids =
+build_property.InvariantGlobalization =
+build_property.PlatformNeutralAssembly =
+build_property.EnforceExtendedAnalyzerRules =
+build_property._SupportedPlatformList = Linux,macOS,Windows
+build_property.RootNamespace = baekjoon_1259
+build_property.ProjectDir = D:\Algorithm\2023\baekjoon_1259\
diff --git a/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.GlobalUsings.g.cs b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.GlobalUsings.g.cs
new file mode 100644
index 0000000..8578f3d
--- /dev/null
+++ b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.GlobalUsings.g.cs
@@ -0,0 +1,8 @@
+//
+global using global::System;
+global using global::System.Collections.Generic;
+global using global::System.IO;
+global using global::System.Linq;
+global using global::System.Net.Http;
+global using global::System.Threading;
+global using global::System.Threading.Tasks;
diff --git a/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.assets.cache b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.assets.cache
new file mode 100644
index 0000000..4b4493a
Binary files /dev/null and b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.assets.cache differ
diff --git a/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.csproj.AssemblyReference.cache b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.csproj.AssemblyReference.cache
new file mode 100644
index 0000000..f00483c
Binary files /dev/null and b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.csproj.AssemblyReference.cache differ
diff --git a/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.csproj.CoreCompileInputs.cache b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.csproj.CoreCompileInputs.cache
new file mode 100644
index 0000000..60ea5ef
--- /dev/null
+++ b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.csproj.CoreCompileInputs.cache
@@ -0,0 +1 @@
+3eed191241bacd56493e1116c44d8b56d0d7c4ef
diff --git a/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.csproj.FileListAbsolute.txt b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.csproj.FileListAbsolute.txt
new file mode 100644
index 0000000..f51639e
--- /dev/null
+++ b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.csproj.FileListAbsolute.txt
@@ -0,0 +1,15 @@
+D:\Algorithm\2023\baekjoon_1259\bin\Debug\net7.0\baekjoon_1259.exe
+D:\Algorithm\2023\baekjoon_1259\bin\Debug\net7.0\baekjoon_1259.deps.json
+D:\Algorithm\2023\baekjoon_1259\bin\Debug\net7.0\baekjoon_1259.runtimeconfig.json
+D:\Algorithm\2023\baekjoon_1259\bin\Debug\net7.0\baekjoon_1259.dll
+D:\Algorithm\2023\baekjoon_1259\bin\Debug\net7.0\baekjoon_1259.pdb
+D:\Algorithm\2023\baekjoon_1259\obj\Debug\net7.0\baekjoon_1259.csproj.AssemblyReference.cache
+D:\Algorithm\2023\baekjoon_1259\obj\Debug\net7.0\baekjoon_1259.GeneratedMSBuildEditorConfig.editorconfig
+D:\Algorithm\2023\baekjoon_1259\obj\Debug\net7.0\baekjoon_1259.AssemblyInfoInputs.cache
+D:\Algorithm\2023\baekjoon_1259\obj\Debug\net7.0\baekjoon_1259.AssemblyInfo.cs
+D:\Algorithm\2023\baekjoon_1259\obj\Debug\net7.0\baekjoon_1259.csproj.CoreCompileInputs.cache
+D:\Algorithm\2023\baekjoon_1259\obj\Debug\net7.0\baekjoon_1259.dll
+D:\Algorithm\2023\baekjoon_1259\obj\Debug\net7.0\refint\baekjoon_1259.dll
+D:\Algorithm\2023\baekjoon_1259\obj\Debug\net7.0\baekjoon_1259.pdb
+D:\Algorithm\2023\baekjoon_1259\obj\Debug\net7.0\baekjoon_1259.genruntimeconfig.cache
+D:\Algorithm\2023\baekjoon_1259\obj\Debug\net7.0\ref\baekjoon_1259.dll
diff --git a/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.dll b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.dll
new file mode 100644
index 0000000..f91861b
Binary files /dev/null and b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.dll differ
diff --git a/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.genruntimeconfig.cache b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.genruntimeconfig.cache
new file mode 100644
index 0000000..4fd3b9b
--- /dev/null
+++ b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.genruntimeconfig.cache
@@ -0,0 +1 @@
+b0c663c8bddabb302b42d0cfcf7653a3b28f91c1
diff --git a/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.pdb b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.pdb
new file mode 100644
index 0000000..51f8ec0
Binary files /dev/null and b/2023/baekjoon_1259/obj/Debug/net7.0/baekjoon_1259.pdb differ
diff --git a/2023/baekjoon_1259/obj/Debug/net7.0/ref/baekjoon_1259.dll b/2023/baekjoon_1259/obj/Debug/net7.0/ref/baekjoon_1259.dll
new file mode 100644
index 0000000..b1074f0
Binary files /dev/null and b/2023/baekjoon_1259/obj/Debug/net7.0/ref/baekjoon_1259.dll differ
diff --git a/2023/baekjoon_1259/obj/Debug/net7.0/refint/baekjoon_1259.dll b/2023/baekjoon_1259/obj/Debug/net7.0/refint/baekjoon_1259.dll
new file mode 100644
index 0000000..b1074f0
Binary files /dev/null and b/2023/baekjoon_1259/obj/Debug/net7.0/refint/baekjoon_1259.dll differ
diff --git a/2023/baekjoon_1259/obj/baekjoon_1259.csproj.nuget.dgspec.json b/2023/baekjoon_1259/obj/baekjoon_1259.csproj.nuget.dgspec.json
new file mode 100644
index 0000000..a38b580
--- /dev/null
+++ b/2023/baekjoon_1259/obj/baekjoon_1259.csproj.nuget.dgspec.json
@@ -0,0 +1,61 @@
+{
+ "format": 1,
+ "restore": {
+ "D:\\Algorithm\\2023\\baekjoon_1259\\baekjoon_1259.csproj": {}
+ },
+ "projects": {
+ "D:\\Algorithm\\2023\\baekjoon_1259\\baekjoon_1259.csproj": {
+ "version": "1.0.0",
+ "restore": {
+ "projectUniqueName": "D:\\Algorithm\\2023\\baekjoon_1259\\baekjoon_1259.csproj",
+ "projectName": "baekjoon_1259",
+ "projectPath": "D:\\Algorithm\\2023\\baekjoon_1259\\baekjoon_1259.csproj",
+ "packagesPath": "C:\\Users\\USER\\.nuget\\packages\\",
+ "outputPath": "D:\\Algorithm\\2023\\baekjoon_1259\\obj\\",
+ "projectStyle": "PackageReference",
+ "configFilePaths": [
+ "C:\\Users\\USER\\AppData\\Roaming\\NuGet\\NuGet.Config"
+ ],
+ "originalTargetFrameworks": [
+ "net7.0"
+ ],
+ "sources": {
+ "https://api.nuget.org/v3/index.json": {}
+ },
+ "frameworks": {
+ "net7.0": {
+ "targetAlias": "net7.0",
+ "projectReferences": {}
+ }
+ },
+ "warningProperties": {
+ "warnAsError": [
+ "NU1605"
+ ]
+ }
+ },
+ "frameworks": {
+ "net7.0": {
+ "targetAlias": "net7.0",
+ "imports": [
+ "net461",
+ "net462",
+ "net47",
+ "net471",
+ "net472",
+ "net48",
+ "net481"
+ ],
+ "assetTargetFallback": true,
+ "warn": true,
+ "frameworkReferences": {
+ "Microsoft.NETCore.App": {
+ "privateAssets": "all"
+ }
+ },
+ "runtimeIdentifierGraphPath": "C:\\Program Files\\dotnet\\sdk\\7.0.306\\RuntimeIdentifierGraph.json"
+ }
+ }
+ }
+ }
+}
\ No newline at end of file
diff --git a/2023/baekjoon_1259/obj/baekjoon_1259.csproj.nuget.g.props b/2023/baekjoon_1259/obj/baekjoon_1259.csproj.nuget.g.props
new file mode 100644
index 0000000..e8e3e23
--- /dev/null
+++ b/2023/baekjoon_1259/obj/baekjoon_1259.csproj.nuget.g.props
@@ -0,0 +1,15 @@
+
+
+
+ True
+ NuGet
+ $(MSBuildThisFileDirectory)project.assets.json
+ $(UserProfile)\.nuget\packages\
+ C:\Users\USER\.nuget\packages\
+ PackageReference
+ 6.6.0
+
+
+
+
+
\ No newline at end of file
diff --git a/2023/baekjoon_1259/obj/baekjoon_1259.csproj.nuget.g.targets b/2023/baekjoon_1259/obj/baekjoon_1259.csproj.nuget.g.targets
new file mode 100644
index 0000000..3dc06ef
--- /dev/null
+++ b/2023/baekjoon_1259/obj/baekjoon_1259.csproj.nuget.g.targets
@@ -0,0 +1,2 @@
+
+
\ No newline at end of file
diff --git a/2023/baekjoon_1259/obj/project.assets.json b/2023/baekjoon_1259/obj/project.assets.json
new file mode 100644
index 0000000..1591959
--- /dev/null
+++ b/2023/baekjoon_1259/obj/project.assets.json
@@ -0,0 +1,66 @@
+{
+ "version": 3,
+ "targets": {
+ "net7.0": {}
+ },
+ "libraries": {},
+ "projectFileDependencyGroups": {
+ "net7.0": []
+ },
+ "packageFolders": {
+ "C:\\Users\\USER\\.nuget\\packages\\": {}
+ },
+ "project": {
+ "version": "1.0.0",
+ "restore": {
+ "projectUniqueName": "D:\\Algorithm\\2023\\baekjoon_1259\\baekjoon_1259.csproj",
+ "projectName": "baekjoon_1259",
+ "projectPath": "D:\\Algorithm\\2023\\baekjoon_1259\\baekjoon_1259.csproj",
+ "packagesPath": "C:\\Users\\USER\\.nuget\\packages\\",
+ "outputPath": "D:\\Algorithm\\2023\\baekjoon_1259\\obj\\",
+ "projectStyle": "PackageReference",
+ "configFilePaths": [
+ "C:\\Users\\USER\\AppData\\Roaming\\NuGet\\NuGet.Config"
+ ],
+ "originalTargetFrameworks": [
+ "net7.0"
+ ],
+ "sources": {
+ "https://api.nuget.org/v3/index.json": {}
+ },
+ "frameworks": {
+ "net7.0": {
+ "targetAlias": "net7.0",
+ "projectReferences": {}
+ }
+ },
+ "warningProperties": {
+ "warnAsError": [
+ "NU1605"
+ ]
+ }
+ },
+ "frameworks": {
+ "net7.0": {
+ "targetAlias": "net7.0",
+ "imports": [
+ "net461",
+ "net462",
+ "net47",
+ "net471",
+ "net472",
+ "net48",
+ "net481"
+ ],
+ "assetTargetFallback": true,
+ "warn": true,
+ "frameworkReferences": {
+ "Microsoft.NETCore.App": {
+ "privateAssets": "all"
+ }
+ },
+ "runtimeIdentifierGraphPath": "C:\\Program Files\\dotnet\\sdk\\7.0.306\\RuntimeIdentifierGraph.json"
+ }
+ }
+ }
+}
\ No newline at end of file
diff --git a/2023/baekjoon_1259/obj/project.nuget.cache b/2023/baekjoon_1259/obj/project.nuget.cache
new file mode 100644
index 0000000..e8a0f1f
--- /dev/null
+++ b/2023/baekjoon_1259/obj/project.nuget.cache
@@ -0,0 +1,8 @@
+{
+ "version": 2,
+ "dgSpecHash": "0XU0qjqmxEbh5ibYB/gh64TtQt+ju1oK86nFEVAcWkJcS1XhuVixp4fzKiHnYXuCB6xQCerlMhMYEOlDNbgt0g==",
+ "success": true,
+ "projectFilePath": "D:\\Algorithm\\2023\\baekjoon_1259\\baekjoon_1259.csproj",
+ "expectedPackageFiles": [],
+ "logs": []
+}
\ No newline at end of file