


'''simple docstring'''







def 						_UpperCamelCase							( UpperCamelCase__     ,   UpperCamelCase__		):






				"""simple docstring"""



				if not isinstance(UpperCamelCase__     ,   UpperCamelCase__		):
								raise TypeError("plaintext must be a string"		)
				if not isinstance(UpperCamelCase__     ,   UpperCamelCase__		):
								raise TypeError("key must be a string"		)

				if not plaintext:
								raise ValueError("plaintext is empty"		)
				if not key:
								raise ValueError("key is empty"		)

				key += plaintext
				__magic_name__				:					List[str]						       =       plaintext.lower()
				__magic_name__				:					Tuple						       =       key.lower()
				__magic_name__				:					Dict						       =       0
				__magic_name__				:					Optional[int]						       =       0
				__magic_name__				:					List[str]						       =       ""
				while plaintext_iterator < len(UpperCamelCase__		):
								if (
								    ord(plaintext[plaintext_iterator]		) < 97
								    or ord(plaintext[plaintext_iterator]		) > 122
								):
												ciphertext += plaintext[plaintext_iterator]
												plaintext_iterator += 1
								elif ord(key[key_iterator]		) < 97 or ord(key[key_iterator]		) > 122:
												key_iterator += 1
								else:
												ciphertext += chr(
												    (
												        (ord(plaintext[plaintext_iterator]		) - 97 + ord(key[key_iterator]		))
												        - 97
												    )
												    % 26
												    + 97		)
												key_iterator += 1
												plaintext_iterator += 1
				return ciphertext



def 						_UpperCamelCase							( UpperCamelCase__     ,   UpperCamelCase__		):






				"""simple docstring"""



				if not isinstance(UpperCamelCase__     ,   UpperCamelCase__		):
								raise TypeError("ciphertext must be a string"		)
				if not isinstance(UpperCamelCase__     ,   UpperCamelCase__		):
								raise TypeError("key must be a string"		)

				if not ciphertext:
								raise ValueError("ciphertext is empty"		)
				if not key:
								raise ValueError("key is empty"		)

				__magic_name__				:					List[str]						       =       key.lower()
				__magic_name__				:					str						       =       0
				__magic_name__				:					Optional[Any]						       =       0
				__magic_name__				:					Tuple						       =       ""
				while ciphertext_iterator < len(UpperCamelCase__		):
								if (
								    ord(ciphertext[ciphertext_iterator]		) < 97
								    or ord(ciphertext[ciphertext_iterator]		) > 122
								):
												plaintext += ciphertext[ciphertext_iterator]
								else:
												plaintext += chr(
												    (ord(ciphertext[ciphertext_iterator]		) - ord(key[key_iterator]		)) % 26
												    + 97		)
												key += chr(
												    (ord(ciphertext[ciphertext_iterator]		) - ord(key[key_iterator]		)) % 26
												    + 97		)
												key_iterator += 1
								ciphertext_iterator += 1
				return plaintext


if __name__ == "__main__":
		import doctest

		doctest.testmod()
		_SCREAMING_SNAKE_CASE       :   Tuple        = int(input("Type 1 to encrypt or 2 to decrypt:"))
		if operation == 1:
				_SCREAMING_SNAKE_CASE       :   Optional[Any]        = input("Typeplaintext to be encrypted:\n")
				_SCREAMING_SNAKE_CASE       :   Tuple        = input("Type the key:\n")
				print(encrypt(plaintext, key))
		elif operation == 2:
				_SCREAMING_SNAKE_CASE       :   Optional[Any]        = input("Type the ciphertext to be decrypted:\n")
				_SCREAMING_SNAKE_CASE       :   List[str]        = input("Type the key:\n")
				print(decrypt(ciphertext, key))
		decrypt("jsqqs avvwo", "coffee")



'''simple docstring'''







def 						_UpperCamelCase							( UpperCamelCase__		):






				"""simple docstring"""



				if not isinstance(UpperCamelCase__     ,   UpperCamelCase__		) or number < 0:
								raise ValueError("Input must be a non-negative integer"		)

				__magic_name__				:					str						       =       number & ~(number - 1)
				__magic_name__				:					Optional[int]						       =       0
				while intermediate:
								intermediate >>= 1
								index += 1
				return index - 1


if __name__ == "__main__":
		import doctest

		doctest.testmod(verbose=True)