题解 | 凯撒加密

import sys

a = int(input().strip())
b = list(input().strip())
c = b.copy()

for i in range(len(b)):
    ch = b[i]
    
    if ch >='a' and ch <='z':
        num_1 = ( ord(ch)+ a - ord('a')) %26 + ord('a')
        c[i] = chr(num_1)
    elif ch >='A' and ch <='Z':
        num_2 = ( ord(ch)+ a - ord('A')) %26 + ord('A')
        c[i] = chr(num_2)


print("".join(map(str,c)))