南邮CTF密码学，mixed_base64

# -*- 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