




"""simple docstring"""





from typing import Literal

_lowercase		 =      """ABCDEFGHIJKLMNOPQRSTUVWXYZ"""

def 						lowerCAmelCase							(	lowerCamelCase ,     lowerCamelCase ,     lowerCamelCase						):
						'''simple docstring'''


						snake_case__    :   Optional[Any]							     =   LETTERS if mode == '''decrypt''' else key
						snake_case__    :   str							     =   key if mode == '''decrypt''' else LETTERS
						snake_case__    :   Any							     =   ''''''
						# loop through each symbol in the message
						for symbol in message:
												if symbol.upper() in chars_a:
																		# encrypt/decrypt the symbol
																		snake_case__    :   Optional[Any]							     =   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						):
						'''simple docstring'''


						return translate_message(lowerCamelCase ,     lowerCamelCase ,     '''encrypt'''						)

def 						lowerCAmelCase							(	lowerCamelCase ,     lowerCamelCase						):
						'''simple docstring'''


						return translate_message(lowerCamelCase ,     lowerCamelCase ,     '''decrypt'''						)

def 						lowerCAmelCase							(	):
						'''simple docstring'''


						snake_case__    :   Optional[Any]							     =   '''Hello World'''
						snake_case__    :   List[str]							     =   '''QWERTYUIOPASDFGHJKLZXCVBNM'''
						snake_case__    :   List[str]							     =   '''decrypt'''  # set to 'encrypt' or 'decrypt'

						if mode == "encrypt":
												snake_case__    :   str							     =   encrypt_message(lowerCamelCase ,     lowerCamelCase						)
						elif mode == "decrypt":
												snake_case__    :   List[str]							     =   decrypt_message(lowerCamelCase ,     lowerCamelCase						)
						print(f'''Using the key {key}, the {mode}ed message is: {translated}'''						)


if __name__ == "__main__":
							import doctest

							doctest.testmod()
							main()








"""simple docstring"""





from __future__ import annotations

from collections.abc import Iterator
from typing import Any

class  __lowercase    :


				'''simple docstring'''


				def __init__(				self				:       List[Any] ,SCREAMING_SNAKE_CASE_				:       Any ):
										snake_case__    :   Any							     =   data
										snake_case__    :   Node | None							     =   None





				def __str__(				self				:       Union[str, Any] ):
										return F'''{self.data}'''







class  __lowercase    :


				'''simple docstring'''


				def __init__(				self				:       Optional[int] ):
										snake_case__    :   Node | None							     =   None
										snake_case__    :   Node | None							     =   None

				def __iter__(				self				:       Optional[int] ):
										snake_case__    :   Optional[int]							     =   self.front
										while node:
																yield node.data
																snake_case__    :   Optional[int]							     =   node.next

				def __len__(				self				:       Any ):
										return len(tuple(iter(self ) ) )

				def __str__(				self				:       Union[str, Any] ):
										return " <- ".join(str(SCREAMING_SNAKE_CASE_ ) for item in self )

				def  _lowerCamelCase   (				self				:       List[str] ):
										return len(self ) == 0

				def  _lowerCamelCase   (				self				:       Optional[int] ,SCREAMING_SNAKE_CASE_				:       Any ):
										snake_case__    :   int							     =   Node(SCREAMING_SNAKE_CASE_ )
										if self.is_empty():
																snake_case__    :   List[Any]							     =   node
										else:
																assert isinstance(self.rear ,SCREAMING_SNAKE_CASE_ )
																snake_case__    :   Union[str, Any]							     =   node
																snake_case__    :   int							     =   node

				def  _lowerCamelCase   (				self				:       int ):
										if self.is_empty():
																raise IndexError('''dequeue from empty queue''' )
										assert isinstance(self.front ,SCREAMING_SNAKE_CASE_ )
										snake_case__    :   List[str]							     =   self.front
										snake_case__    :   str							     =   self.front.next
										if self.front is None:
																snake_case__    :   Optional[Any]							     =   None
										return node.data





				def  _lowerCamelCase   (				self				:       Optional[int] ):
										snake_case__    :   Optional[Any]							     =   None


if __name__ == "__main__":
							from doctest import testmod

							testmod()


