input: 
  from Crypto.Cipher import AES
  
  key = b'Sixteen byte key'
  
  def encrypt(plaintext):
      """Encrypt the given plaintext using AES encryption in ECB mode.
      >>> encrypt(b'hello')
      b'\x81\xf4yG\xb1\xd6^N\x0b\xd9\xaev(cm'
      """
      cipher = AES.new(key, AES.MODE_ECB)
      return cipher.encrypt(plaintext)
  
  def decrypt(ciphertext):
      """Decrypt the given ciphertext using AES decryption in ECB mode.
      >>> decrypt(b'\x81\xf4yG\xb1\xd6^N\x0b\xd9\xaev(cm')
      b'hello'
      """
      cipher = AES.new(key, AES.MODE_ECB)
      return cipher.decrypt(ciphertext)
  
output:     cipher = AES.new(key, AES.MODE_ECB)
      return cipher.decrypt(ciphertext)