




from typing import Literal

__A						:		List[str]          =						"ABCDEFGHIJKLMNOPQRSTUVWXYZ"





def      UpperCAmelCase  (						UpperCamelCase__						,			UpperCamelCase__						,			UpperCamelCase__   )     ->     str:







				'''simple docstring'''


				__lowerCAmelCase					=  LETTERS if mode == """decrypt""" else key
				__lowerCAmelCase					=  key if mode == """decrypt""" else LETTERS
				__lowerCAmelCase					=  """"""
				# loop through each symbol in the message
				for symbol in message:
								if symbol.upper() in chars_a:
												# encrypt/decrypt the symbol
												__lowerCAmelCase					=  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      UpperCAmelCase  (						UpperCamelCase__						,			UpperCamelCase__   )     ->     str:







				'''simple docstring'''


				return translate_message(UpperCamelCase__						,			UpperCamelCase__						,			"""encrypt"""   )





def      UpperCAmelCase  (						UpperCamelCase__						,			UpperCamelCase__   )     ->     str:







				'''simple docstring'''


				return translate_message(UpperCamelCase__						,			UpperCamelCase__						,			"""decrypt"""   )





def      UpperCAmelCase  (						)     ->     None:







				'''simple docstring'''


				__lowerCAmelCase					=  """Hello World"""
				__lowerCAmelCase					=  """QWERTYUIOPASDFGHJKLZXCVBNM"""
				__lowerCAmelCase					=  """decrypt"""  # set to 'encrypt' or 'decrypt'

				if mode == "encrypt":
								__lowerCAmelCase					=  encrypt_message(UpperCamelCase__						,			UpperCamelCase__   )
				elif mode == "decrypt":
								__lowerCAmelCase					=  decrypt_message(UpperCamelCase__						,			UpperCamelCase__   )
				print(F'''Using the key {key}, the {mode}ed message is: {translated}'''   )


if __name__ == "__main__":
	import doctest

	doctest.testmod()
	main()







'''simple docstring'''





class 			UpperCamelCase__	:






 def __init__(      self	:Optional[Any]						,					_A	:Tuple      )					->      Tuple:







       '''simple docstring'''



       __A													=      data
       __A													=      None
       __A													=      None






 def __str__(      self	:List[str]      )					->      Optional[int]:







       '''simple docstring'''



       return F'{self.data}'


class 			UpperCamelCase__	:






 def __init__(      self	:List[Any]      )					->      Any:







       '''simple docstring'''



       __A													=      None
       __A													=      None






 def __iter__(      self	:Optional[int]      )					->      List[Any]:







       '''simple docstring'''



       __A													=      self.head
       while node:
             yield node.data
             __A													=      node.next






 def __str__(      self	:Dict      )					->      Union[str, Any]:







       '''simple docstring'''



       return "->".join([str(_A      ) for item in self]      )






 def __len__(      self	:int      )					->      List[str]:







       '''simple docstring'''



       return sum(1 for _ in self      )






 def 						lowercase_    (      self	:List[str]						,					_A	:Any      )					->      str:







       '''simple docstring'''



       self.insert_at_nth(0						,					_A      )






 def 						lowercase_    (      self	:Dict						,					_A	:Optional[Any]      )					->      Tuple:







       '''simple docstring'''



       self.insert_at_nth(len(self      )						,					_A      )






 def 						lowercase_    (      self	:Optional[int]						,					_A	:int						,					_A	:Optional[int]      )					->      int:







       '''simple docstring'''



       __A													=      len(self      )

       if not 0 <= index <= length:
             raise IndexError('list index out of range'      )
       __A													=      Node(_A      )
       if self.head is None:
             __A													=      __A													=      new_node
       elif index == 0:
             __A													=      new_node
             __A													=      self.head
             __A													=      new_node
       elif index == length:
             __A													=      new_node
             __A													=      self.tail
             __A													=      new_node
       else:
             __A													=      self.head
             for _ in range(0						,					_A      ):
                   __A													=      temp.next
             __A													=      new_node
             __A													=      temp.previous
             __A													=      temp
             __A													=      new_node






 def 						lowercase_    (      self	:Optional[int]      )					->      List[str]:







       '''simple docstring'''



       return self.delete_at_nth(0      )






 def 						lowercase_    (      self	:Any      )					->      Tuple:







       '''simple docstring'''



       return self.delete_at_nth(len(self      ) - 1      )






 def 						lowercase_    (      self	:Dict						,					_A	:int      )					->      List[str]:







       '''simple docstring'''



       __A													=      len(self      )

       if not 0 <= index <= length - 1:
             raise IndexError('list index out of range'      )
       __A													=      self.head  # default first node
       if length == 1:
             __A													=      __A													=      None
       elif index == 0:
             __A													=      self.head.next
             __A													=      None
       elif index == length - 1:
             __A													=      self.tail
             __A													=      self.tail.previous
             __A													=      None
       else:
             __A													=      self.head
             for _ in range(0						,					_A      ):
                   __A													=      temp.next
             __A													=      temp
             __A													=      temp.previous
             __A													=      temp.next
       return delete_node.data






 def 						lowercase_    (      self	:List[str]						,					_A	:Dict      )					->      str:







       '''simple docstring'''



       __A													=      self.head

       while current.data != data:  # Find the position to delete
             if current.next:
                   __A													=      current.next
             else:  # We have reached the end an no value matches
                   raise ValueError('No data matching given value'      )

       if current == self.head:
             self.delete_head()

       elif current == self.tail:
             self.delete_tail()

       else:  # Before: 1 <--> 2(current) <--> 3
             __A													=      current.next  # 1 --> 3
             __A													=      current.previous  # 1 <--> 3
       return data






 def 						lowercase_    (      self	:List[str]      )					->      Tuple:







       '''simple docstring'''



       return len(self      ) == 0





def 							snake_case				(		)->      None:







      """simple docstring"""
      __A													=      DoublyLinkedList()
      assert linked_list.is_empty() is True
      assert str(UpperCAmelCase						) == ""

      try:
            linked_list.delete_head()
            raise AssertionError  # This should not happen.
      except IndexError:
            assert True  # This should happen.

      try:
            linked_list.delete_tail()
            raise AssertionError  # This should not happen.
      except IndexError:
            assert True  # This should happen.

      for i in range(1_0						):
            assert len(UpperCAmelCase						) == i
            linked_list.insert_at_nth(UpperCAmelCase   ,	i + 1						)
      assert str(UpperCAmelCase						) == "->".join(str(UpperCAmelCase						) for i in range(1   ,	1_1						)						)

      linked_list.insert_at_head(0						)
      linked_list.insert_at_tail(1_1						)
      assert str(UpperCAmelCase						) == "->".join(str(UpperCAmelCase						) for i in range(0   ,	1_2						)						)

      assert linked_list.delete_head() == 0
      assert linked_list.delete_at_nth(9						) == 1_0
      assert linked_list.delete_tail() == 1_1
      assert len(UpperCAmelCase						) == 9
      assert str(UpperCAmelCase						) == "->".join(str(UpperCAmelCase						) for i in range(1   ,	1_0						)						)


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

 testmod()






