






def 				_lowerCAmelCase      (_lowerCAmelCase				,		_lowerCAmelCase):
					UpperCamelCase_											=				0
					for ele in arr:
										total_sum += product_sum(_lowerCAmelCase				,		depth + 1) if isinstance(_lowerCAmelCase				,		_lowerCAmelCase) else ele
					return total_sum * depth



def 				_lowerCAmelCase      (_lowerCAmelCase):
					return product_sum(_lowerCAmelCase				,		1)


if __name__ == "__main__":
	import doctest

	doctest.testmod()





from typing import Literal

UpperCAmelCase				:							Tuple								="""ABCDEFGHIJKLMNOPQRSTUVWXYZ"""



def 				_lowerCAmelCase      (_lowerCAmelCase				,		_lowerCAmelCase				,		_lowerCAmelCase):
					UpperCamelCase_											=				LETTERS if mode == "decrypt" else key
					UpperCamelCase_											=				key if mode == "decrypt" else LETTERS
					UpperCamelCase_											=				""
					# loop through each symbol in the message
					for symbol in message:
										if symbol.upper() in chars_a:
															# encrypt/decrypt the symbol
															UpperCamelCase_											=				chars_a.find(symbol.upper())
															if symbol.isupper():
																				translated += chars_b[sym_index].upper()
															else:
																				translated += chars_b[sym_index].lower()
										else:
															# symbol is not in LETTERS, just add it
															translated += symbol
					return translated



def 				_lowerCAmelCase      (_lowerCAmelCase				,		_lowerCAmelCase):
					return translate_message(_lowerCAmelCase				,		_lowerCAmelCase				,		"encrypt")



def 				_lowerCAmelCase      (_lowerCAmelCase				,		_lowerCAmelCase):
					return translate_message(_lowerCAmelCase				,		_lowerCAmelCase				,		"decrypt")



def 				_lowerCAmelCase      ():
					UpperCamelCase_											=				"Hello World"
					UpperCamelCase_											=				"QWERTYUIOPASDFGHJKLZXCVBNM"
					UpperCamelCase_											=				"decrypt"  # set to 'encrypt' or 'decrypt'

					if mode == "encrypt":
										UpperCamelCase_											=				encrypt_message(_lowerCAmelCase				,		_lowerCAmelCase)
					elif mode == "decrypt":
										UpperCamelCase_											=				decrypt_message(_lowerCAmelCase				,		_lowerCAmelCase)
					print(f"""Using the key {key}, the {mode}ed message is: {translated}""")


if __name__ == "__main__":
	import doctest

	doctest.testmod()
	main()
