



'''simple docstring'''


import random
import sys

lowercase											=      '''ABCDEFGHIJKLMNOPQRSTUVWXYZ'''






def 			UpperCAmelCase_							(		):


     '''simple docstring'''







     a_									=input("Enter message: "							)
     a_									="LFWOAYUISVKMNXPBDCRJTQEGHZ"
     a_									=input("Encrypt/Decrypt [e/d]: "							)

     check_valid_key(A_							)

     if resp.lower().startswith("e"							):
          a_									="encrypt"
          a_									=encrypt_message(A_							,						A_							)
     elif resp.lower().startswith("d"							):
          a_									="decrypt"
          a_									=decrypt_message(A_							,						A_							)

     print(F"""\n{mode.title()}ion: \n{translated}"""							)






def 			UpperCAmelCase_							(		lowercase__							):


     '''simple docstring'''







     a_									=list(A_							)
     a_									=list(A_							)
     key_list.sort()
     letters_list.sort()

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






def 			UpperCAmelCase_							(		lowercase__							,						lowercase__							):


     '''simple docstring'''







     return translate_message(A_							,						A_							,						"encrypt"							)






def 			UpperCAmelCase_							(		lowercase__							,						lowercase__							):


     '''simple docstring'''







     return translate_message(A_							,						A_							,						"decrypt"							)






def 			UpperCAmelCase_							(		lowercase__							,						lowercase__							,						lowercase__							):


     '''simple docstring'''







     a_									=""
     a_									=LETTERS
     a_									=key

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

     for symbol in message:
          if symbol.upper() in chars_a:
               a_									=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'''







     a_									=list(A_							)
     random.shuffle(A_							)
     return "".join(A_							)


if __name__ == "__main__":
  main()






def 	_lowerCamelCase  (		A_  :	float							,  A_  :	float							,  A_  :	int      )			->			float:

   '''simple docstring'''






   UpperCamelCase__ :			Union[str, Any] 						=[1 / first_term]
   UpperCamelCase__ :			Tuple 						=1 / first_term
   for _ in range(number_of_terms - 1      ):
      first_term += common_difference
      arithmetic_progression.append(A_      )
   UpperCamelCase__ :			List[str] 						=[1 / step for step in arithmetic_progression]
   return sum(A_      )


if __name__ == "__main__":
     import doctest

     doctest.testmod()
     print(sum_of_harmonic_progression(1 / 2, 2, 2))

