code: 
  
  
  
  
  '''simple docstring'''
  
  
  
  
  
  import random
  import sys
  
  lowercase__				=	"""ABCDEFGHIJKLMNOPQRSTUVWXYZ"""
  
  
  def 				UpperCamelCase	(  ):
  
  
  
  
     '''simple docstring'''
  
     SCREAMING_SNAKE_CASE__			:				Optional[Any]       						= input('''Enter message: '''   )
     SCREAMING_SNAKE_CASE__			:				Union[str, Any]       						= """LFWOAYUISVKMNXPBDCRJTQEGHZ"""
     SCREAMING_SNAKE_CASE__			:				Any       						= input('''Encrypt/Decrypt [e/d]: '''   )
  
     check_valid_key(__lowerCamelCase   )
  
     if resp.lower().startswith('''e'''   ):
        SCREAMING_SNAKE_CASE__			:				Union[str, Any]       						= """encrypt"""
        SCREAMING_SNAKE_CASE__			:				Union[str, Any]       						= encrypt_message(__lowerCamelCase	,     __lowerCamelCase   )
     elif resp.lower().startswith('''d'''   ):
        SCREAMING_SNAKE_CASE__			:				Optional[int]       						= """decrypt"""
        SCREAMING_SNAKE_CASE__			:				Optional[int]       						= decrypt_message(__lowerCamelCase	,     __lowerCamelCase   )
  
     print(f"""\n{mode.title()}ion: \n{translated}"""   )
  
  
  def 				UpperCamelCase	(  snake_case   ):
  
  
  
  
     '''simple docstring'''
  
     SCREAMING_SNAKE_CASE__			:				List[str]       						= list(__lowerCamelCase   )
     SCREAMING_SNAKE_CASE__			:				Optional[Any]       						= list(__lowerCamelCase   )
     key_list.sort()
     letters_list.sort()
  
     if key_list != letters_list:
        sys.exit('''Error in the key or symbol set.'''   )
  
  
  def 				UpperCamelCase	(  snake_case	,     snake_case   ):
  
  
  
  
     '''simple docstring'''
  
     return translate_message(__lowerCamelCase	,     __lowerCamelCase	,     '''encrypt'''   )
  
  
  def 				UpperCamelCase	(  snake_case	,     snake_case   ):
  
  
  
  
     '''simple docstring'''
  
     return translate_message(__lowerCamelCase	,     __lowerCamelCase	,     '''decrypt'''   )
  
  
  def 				UpperCamelCase	(  snake_case	,     snake_case	,     snake_case   ):
  
  
  
  
     '''simple docstring'''
  
     SCREAMING_SNAKE_CASE__			:				Optional[int]       						= """"""
     SCREAMING_SNAKE_CASE__			:				str       						= LETTERS
     SCREAMING_SNAKE_CASE__			:				List[str]       						= key
  
     if mode == "decrypt":
        SCREAMING_SNAKE_CASE__			:				Any       						= chars_b, chars_a
  
     for symbol in message:
        if symbol.upper() in chars_a:
           SCREAMING_SNAKE_CASE__			:				List[str]       						= chars_a.find(symbol.upper()   )
           if symbol.isupper():
              translated += chars_b[sym_index].upper()
           else:
              translated += chars_b[sym_index].lower()
        else:
           translated += symbol
  
     return translated
  
  
  def 				UpperCamelCase	(  ):
  
  
  
  
     '''simple docstring'''
  
     SCREAMING_SNAKE_CASE__			:				Optional[int]       						= list(__lowerCamelCase   )
     random.shuffle(__lowerCamelCase   )
     return "".join(__lowerCamelCase   )
  
  
  if __name__ == "__main__":
         main()
  
  
style_context: 
  
  
  
  
  '''simple docstring'''
  
  
  
  
  
  def 				UpperCamelCase	(  snake_case = 99_80_01   ):
  
  
  
  
     '''simple docstring'''
  
     for number in range(n - 1	,     99_99	,     -1   ):
        SCREAMING_SNAKE_CASE__			:				int       						= str(snake_case   )
  
        # checks whether 'str_number' is a palindrome.
        if str_number == str_number[::-1]:
           SCREAMING_SNAKE_CASE__			:				Any       						= 9_99
  
           # if 'number' is a product of two 3-digit numbers
           # then number is the answer otherwise fetch next number.
           while divisor != 99:
              if (number % divisor == 0) and (len(str(number // divisor   )   ) == 3.0):
                 return number
              divisor -= 1
     raise ValueError('''That number is larger than our acceptable range.'''   )
  
  
  if __name__ == "__main__":
         print(F"{solution() = }")
  
  