


import random
import sys

__snake_case             =	'''ABCDEFGHIJKLMNOPQRSTUVWXYZ'''






def 		_A		(		)				->   None:


     """simple docstring"""


     __UpperCamelCase   = input('Enter message: '   )
     __UpperCamelCase   = 'LFWOAYUISVKMNXPBDCRJTQEGHZ'
     __UpperCamelCase   = input('Encrypt/Decrypt [e/d]: '   )

     check_valid_key(_lowercase   )

     if resp.lower().startswith('e'   ):
          __UpperCamelCase   = 'encrypt'
          __UpperCamelCase   = encrypt_message(_lowercase				,     _lowercase   )
     elif resp.lower().startswith('d'   ):
          __UpperCamelCase   = 'decrypt'
          __UpperCamelCase   = decrypt_message(_lowercase				,     _lowercase   )

     print(f'''\n{mode.title()}ion: \n{translated}'''   )






def 		_A		(		_lowercase   )				->   None:


     """simple docstring"""


     __UpperCamelCase   = list(_lowercase   )
     __UpperCamelCase   = list(_lowercase   )
     key_list.sort()
     letters_list.sort()

     if key_list != letters_list:
          sys.exit('Error in the key or symbol set.'   )






def 		_A		(		_lowercase				,     _lowercase   )				->   str:


     """simple docstring"""


     return translate_message(_lowercase				,     _lowercase				,     'encrypt'   )






def 		_A		(		_lowercase				,     _lowercase   )				->   str:


     """simple docstring"""


     return translate_message(_lowercase				,     _lowercase				,     'decrypt'   )






def 		_A		(		_lowercase				,     _lowercase				,     _lowercase   )				->   str:


     """simple docstring"""


     __UpperCamelCase   = ''
     __UpperCamelCase   = LETTERS
     __UpperCamelCase   = key

     if mode == "decrypt":
          __UpperCamelCase,						__UpperCamelCase   = chars_b, chars_a

     for symbol in message:
          if symbol.upper() in chars_a:
               __UpperCamelCase   = 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 		_A		(		)				->   str:


     """simple docstring"""


     __UpperCamelCase   = list(_lowercase   )
     random.shuffle(_lowercase   )
     return "".join(_lowercase   )


if __name__ == "__main__":
    main()






def 		_A		(		_lowercase   )				->   bool:


     """simple docstring"""


     if not isinstance(_lowercase				,     _lowercase   ):
          raise ValueError('Input series is not valid, valid series - [1, 2/3, 2]'   )
     if len(_lowercase   ) == 0:
          raise ValueError('Input list must be a non empty list'   )
     if len(_lowercase   ) == 1 and series[0] != 0:
          return True
     __UpperCamelCase   = []
     __UpperCamelCase   = len(_lowercase   )
     for i in range(0				,     _lowercase   ):
          if series[i] == 0:
               raise ValueError('Input series cannot have 0 as an element'   )
          rec_series.append(1 / series[i]   )
     __UpperCamelCase   = rec_series[1] - rec_series[0]
     for index in range(2				,     _lowercase   ):
          if rec_series[index] - rec_series[index - 1] != common_diff:
               return False
     return True






def 		_A		(		_lowercase   )				->   float:


     """simple docstring"""


     if not isinstance(_lowercase				,     _lowercase   ):
          raise ValueError('Input series is not valid, valid series - [2, 4, 6]'   )
     if len(_lowercase   ) == 0:
          raise ValueError('Input list must be a non empty list'   )
     __UpperCamelCase   = 0
     for val in series:
          answer += 1 / val
     return len(_lowercase   ) / answer


if __name__ == "__main__":
    import doctest

    doctest.testmod()


