input: from Crypto.Cipher import AES
  
  key = b'Sixteen byte key'
  
  def encrypt(plaintext):
      """Encrypts the given plaintext using AES encryption in ECB mode.
      >>> encrypt(b'HelloWorld')
      b'\xe6HvwA\xf5\xe3\t=}X1Mp#'
      """
      cipher = AES.new(key, AES.MODE_ECB)
      return cipher.encrypt(plaintext)
  
  def decrypt(ciphertext):
      """Decrypts the given ciphertext using AES decryption in ECB mode.
      >>> decrypt(b'\xe6HvwA\xf5\xe3\t=}X1Mp#')
      b'HelloWorld'
      """
      cipher = AES.new(key, AES.MODE_ECB)
      return cipher.decrypt(ciphertext)
output:     cipher = AES.new(key, AES.MODE_ECB)
      return cipher.decrypt(ciphertext)