input: from Crypto.Cipher import AES
  
  key = b'Sixteen byte key'
  
  def encrypt(plaintext: str) -> bytes:
      """ Encrypts the given plaintext using AES encryption algorithm in ECB mode.
      >>> encrypt('HelloWorld')
      b'\\xe7\\x8d}\\xd7\\xe0c@]n\\x8a\\xe7mF\\xc2B\\xab'
      >>> encrypt('Python')
      b'\\xe95\\xcc\\xd9n\\xf8U\\xb5\\x9c/~*\\x17\\x8b\\xaa#\\xadB'
      """
      cipher = AES.new(key, AES.MODE_ECB)
      return cipher.encrypt(plaintext.encode())
  
  def decrypt(ciphertext: bytes) -> str:
      """ Decrypts the given ciphertext using AES encryption algorithm in ECB mode.
      >>> decrypt(b'\\xe7\\x8d}\\xd7\\xe0c@]n\\x8a\\xe7mF\\xc2B\\xab')
      'HelloWorld'
      >>> decrypt(b'\\xe95\\xcc\\xd9n\\xf8U\\xb5\\x9c/~*\\x17\\x8b\\xaa#\\xadB')
      'Python'
      """
      cipher = AES.new(key, AES.MODE_ECB)
      return cipher.decrypt(ciphertext).decode()
output:     cipher = AES.new(key, AES.MODE_ECB)
      return cipher.decrypt(ciphertext).decode()