code: def decrypt(key, ciphertext, shift_function=shift_case_english):
      
      return [shift_function(key, symbol) for symbol in ciphertext]
docs: Decrypt Shift enciphered ``ciphertext`` using ``key``.
  
      Examples:
          >>> ''.join(decrypt(3, "KHOOR"))
          HELLO
  
          >> decrypt(15, [0xcf, 0x9e, 0xaf, 0xe0], shift_bytes)
          [0xde, 0xad, 0xbe, 0xef]
  
      Args:
          key (int): The shift to use
          ciphertext (iterable): The symbols to decrypt
          shift_function (function (shift, symbol)): Shift function to apply to symbols in the ciphertext
  
      Returns:
          Decrypted ciphertext, list of plaintext symbols