Counting_DNA_Nucleotides.py

DNA = input()
A_count = 0
C_count = 0
G_count = 0
T_count = 0

for i in DNA:
    if i == 'A':
        A_count += 1
    elif i == 'C':
        C_count += 1
    elif i == 'G':
        G_count += 1
    else:
        T_count += 1

print(A_count, C_count, G_count, T_count)