input: from Crypto.Cipher import AES
  
  key = b'Sixteen byte key'
  
  def encrypt(plaintext):
      """ Encrypts a given plaintext string using AES encryption in ECB mode.
      >>> encrypt(b'Hello, World!')
      b's@\x001W\x06\\RBabde\\23abc '
      """
      cipher = AES.new(key, AES.MODE_ECB)
      return cipher.encrypt(plaintext)
  
  def decrypt(ciphertext):
      """ Decrypts a given ciphertext string using AES encryption in ECB mode.
      >>> decrypt(b's@\x001W\x06\\RBabde\\23abc ')
      b'Hello, World!'
      """
      cipher = AES.new(key, AES.MODE_ECB)
      return cipher.decrypt(ciphertext)
output:     cipher = AES.new(key, AES.MODE_ECB)
      return cipher.decrypt(ciphertext)