from base64 import b64decode
from binascii import unhexlify
from Crypto.Cipher import AES
s = b64decode('4RTlF9Ca2+oqExJwx68FiA==')
k = unhexlify('6DDEF7A43C004F7D6983044B1E36A93459F18BC837C46EAF321132734163A0B4')
iv = 'Kanxue2019CTF-Q1'
aes = AES.new(k, AES.MODE_CBC, iv)
print(aes.decrypt(s))
