diff --git a/aliennumbers.cpp b/aliennumbers.cpp
new file mode 100644
index 0000000..75c5ba5
--- /dev/null
+++ b/aliennumbers.cpp
@@ -0,0 +1,23 @@
+// GitHub: EntityPlantt/Kattis
+#include <iostream>
+using namespace std;
+int main() {
+    int t;
+    cin >> t;
+    string nStr, sys1, sys2;
+    size_t n = 0;
+    for (int i = 1; i <= t; i++) {
+        cin >> nStr >> sys1 >> sys2;
+        while (!nStr.empty()) {
+            n *= sys1.size();
+            n += sys1.find(nStr[0]);
+            nStr = nStr.substr(1);
+        }
+        do {
+            nStr = sys2[n % sys2.size()] + nStr;
+            n /= sys2.size();
+        } while (n);
+        cout << "Case #" << i << ": " << nStr << '\n';
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/aliennumbers.js b/aliennumbers.js
new file mode 100644
index 0000000..cb05f74
--- /dev/null
+++ b/aliennumbers.js
@@ -0,0 +1,27 @@
+// GitHub: EntityPlantt/Kattis
+var t = null, i = 1;
+require("readline").createInterface({
+	input: process.stdin,
+	output: process.stdout
+}).on("line", input => {
+	if (t == null) {
+		t = parseInt(input);
+	}
+	else {
+		var [nStr, sys1, sys2] = input.split(" "), n = 0;
+		while (nStr.length > 0) {
+			n *= sys1.length;
+			n += sys1.indexOf(nStr[0]);
+			nStr = nStr.substr(1);
+		}
+		do {
+			nStr = sys2[n % sys2.length] + nStr;
+			n = Math.floor(n / sys2.length);
+		} while (n > 0);
+		console.log("Case #" + i + ": " + nStr);
+		i++;
+		if (t < i) {
+			process.exit();
+		}
+	}
+});
\ No newline at end of file