题解 | 凯撒加密

n = int(input())

s = str(input().strip())

result = []
for char in s:
    if 'a' <= char <= "z":
        new_char = chr((ord(char) - ord('a') + n) % 26 + ord('a'))
    elif 'A' <= char <= "Z":
        new_char = chr((ord(char) - ord('A') + n) % 26 + ord('A'))
    else:
        new_char = char
    result.append(new_char)

print("".join(result))