input: from Crypto.Cipher import AES
  
  key = b'Sixteen byte key'
  
  def encrypt(plaintext):
      """ Encrypts the given plaintext using AES encryption with a predefined key in ECB mode.
      >>> encrypt(b'Hello, World!')
      b's6fQ\x1e\xca\x83\x97\x1f\x02Pe'
      """
      cipher = AES.new(key, AES.MODE_ECB)
      return cipher.encrypt(plaintext)
  
  def decrypt(ciphertext):
      """ Decrypts the given ciphertext using AES decryption with a predefined key in ECB mode.
      >>> decrypt(b's6fQ\x1e\xca\x83\x97\x1f\x02Pe')
      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)