
def 		_snake_case(    SCREAMING_SNAKE_CASE__							)					->       Optional[int]:
       if not numbers:
              return 0

       if not isinstance(__a   ,      (list, tuple)							) or not all(
           isinstance(__a   ,      __a							) for number in numbers							):
              raise ValueError("""numbers must be an iterable of integers"""							)

       lowercase				:	Optional[Any]			      = numbers[0]

       for i in range(1   ,      len(__a							)							):
              # update the maximum and minimum subarray products
              lowercase				:	Any			      = numbers[i]
              if number < 0:
                     lowercase      ,     lowercase				:	Optional[Any]			      = min_till_now, max_till_now
              lowercase				:	Optional[Any]			      = max(__a   ,      max_till_now * number							)
              lowercase				:	List[str]			      = min(__a   ,      min_till_now * number							)

              # update the maximum product found till now
              lowercase				:	List[Any]			      = max(__a   ,      __a							)

       return max_prod




_lowerCAmelCase:						List[str]   				=       'ABCDEFGHIJKLMNOPQRSTUVWXYZ'






def   _lowercase(					):
							a__      =input('Enter message: '     )
							a__      =input('Enter key [alphanumeric]: '     )
							a__      =input('Encrypt/Decrypt [e/d]: '     )

							if mode.lower().startswith('e'     ):
														a__      ='encrypt'
														a__      =encrypt_message(__a    ,     __a     )
							elif mode.lower().startswith('d'     ):
														a__      ='decrypt'
														a__      =decrypt_message(__a    ,     __a     )

							print(f"""\n{mode.title()}ed message:"""     )
							print(__a     )






def   _lowercase(					__a				:						str    ,     __a				:						str     ):
							return translate_message(__a    ,     __a    ,     'encrypt'     )






def   _lowercase(					__a				:						str    ,     __a				:						str     ):
							return translate_message(__a    ,     __a    ,     'decrypt'     )






def   _lowercase(					__a				:						str    ,     __a				:						str    ,     __a				:						str     ):
							a__      =[]
							a__      =0
							a__      =key.upper()

							for symbol in message:
														a__      =LETTERS.find(symbol.upper()     )
														if num != -1:
																					if mode == "encrypt":
																												num += LETTERS.find(key[key_index]     )
																					elif mode == "decrypt":
																												num -= LETTERS.find(key[key_index]     )

																					num %= len(__a     )

																					if symbol.isupper():
																												translated.append(LETTERS[num]     )
																					elif symbol.islower():
																												translated.append(LETTERS[num].lower()     )

																					key_index += 1
																					if key_index == len(__a     ):
																												a__      =0
														else:
																					translated.append(__a     )
							return "".join(__a     )


if __name__ == "__main__":
	main()

