text: #!/usr/bin/env python3
  
  from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
  from cryptography.hazmat.backends import default_backend
  import base64, binascii
  
  input = base64.b64decode(open('7.txt').read())
  
  key = b'YELLOW SUBMARINE'
  
  cipher = Cipher(algorithms.AES(key), modes.ECB(), backend=default_backend())
  
  decryptor = cipher.decryptor()
  print(decryptor.update(input) + decryptor.finalize())
  