inno quest ikb

import sys
from base64 import b64decode


sys.stdin = open(r"path to messages.txt")

def caesar_cipher(text, shift):
    result = ""
    for char in text:
        if char.isalpha():
            start = ord('A') if char.isupper() else ord('a')
            result += chr((ord(char) - start + shift) % 26 + start)
        else:
            result += char
    return result

def decode(line):
    s = b64decode(line.split()[2])
    ciphertext = caesar_cipher(str(s)[2:-1], 13)
    return ciphertext

while True:
    plaintext = input()
    print(decode(plaintext))