# -*- coding:utf-8 -*-

from base64 import *

flag = open("code.txt").readline()  # 读取密文

for i in range(10):

    pointer = 0

    try:

        temp = b16decode(flag)

    except TypeError:

        pointer = 1  # 指示是否发生TypeError异常

    if pointer == 1 or '�' in temp:  # 如果解码方式不对，就会提示TypeError，或者乱码，发现乱码中必有'�'

        pointer = 0

        try:

            temp = b32decode(flag)

        except TypeError:

            pointer = 1

        if pointer == 1 or '�' in temp:

            temp = b64decode(flag)

    flag = temp

print flag