code: 
  
  
  
  '''simple docstring'''
  
  
  
  
  
  import random
  import sys
  
  lowerCAmelCase__	:  Union[str, Any] 		='''ABCDEFGHIJKLMNOPQRSTUVWXYZ'''
  
  
  
  
  
  
  def 			__lowercase     (				)       ->				None:
  							__SCREAMING_SNAKE_CASE								=      input('Enter message: '     )
  							__SCREAMING_SNAKE_CASE								=      'LFWOAYUISVKMNXPBDCRJTQEGHZ'
  							__SCREAMING_SNAKE_CASE								=      input('Encrypt/Decrypt [e/d]: '     )
  
  							check_valid_key(a__     )
  
  							if resp.lower().startswith('e'     ):
  														__SCREAMING_SNAKE_CASE								=      'encrypt'
  														__SCREAMING_SNAKE_CASE								=      encrypt_message(a__							,     a__     )
  							elif resp.lower().startswith('d'     ):
  														__SCREAMING_SNAKE_CASE								=      'decrypt'
  														__SCREAMING_SNAKE_CASE								=      decrypt_message(a__							,     a__     )
  
  							print(f"""\n{mode.title()}ion: \n{translated}"""     )
  
  
  
  
  
  
  def 			__lowercase     (				a__     )       ->				None:
  							__SCREAMING_SNAKE_CASE								=      list(a__     )
  							__SCREAMING_SNAKE_CASE								=      list(a__     )
  							key_list.sort()
  							letters_list.sort()
  
  							if key_list != letters_list:
  														sys.exit('Error in the key or symbol set.'     )
  
  
  
  
  
  
  def 			__lowercase     (				a__							,     a__     )       ->				str:
  							return translate_message(a__							,     a__							,     'encrypt'     )
  
  
  
  
  
  
  def 			__lowercase     (				a__							,     a__     )       ->				str:
  							return translate_message(a__							,     a__							,     'decrypt'     )
  
  
  
  
  
  
  def 			__lowercase     (				a__							,     a__							,     a__     )       ->				str:
  							__SCREAMING_SNAKE_CASE								=      ''
  							__SCREAMING_SNAKE_CASE								=      LETTERS
  							__SCREAMING_SNAKE_CASE								=      key
  
  							if mode == "decrypt":
  														__SCREAMING_SNAKE_CASE							, __SCREAMING_SNAKE_CASE								=      chars_b, chars_a
  
  							for symbol in message:
  														if symbol.upper() in chars_a:
  																					__SCREAMING_SNAKE_CASE								=      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 			__lowercase     (				)       ->				str:
  							__SCREAMING_SNAKE_CASE								=      list(a__     )
  							random.shuffle(a__     )
  							return "".join(a__     )
  
  
  if __name__ == "__main__":
  			main()
  
  
  
  
  
  
  
style_context: 
  
  
  
  from __future__ import annotations
  
  class      UpperCAmelCase_						:
  
  						'''simple docstring'''
  
  
  
  
  						def __init__(					self   ,							_A	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													__SCREAMING_SNAKE_CASE								=      value
  													__SCREAMING_SNAKE_CASE								=      None
  													__SCREAMING_SNAKE_CASE								=      None
  
  
  
  
  
  
  
  class      UpperCAmelCase_						:
  
  						'''simple docstring'''
  
  
  
  
  						UpperCamelCase__    :				int
  
  
  
  
  
  
  						def __init__(					self	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													__SCREAMING_SNAKE_CASE								=      0
  
  
  
  
  
  
  						def  _A			(					self   ,							_A   ,							_A	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													if node is None:
  																				return
  
  													if path_sum == self.target:
  																				self.paths += 1
  
  													if node.left:
  																				self.depth_first_search(node.left   ,							path_sum + node.left.value	)
  													if node.right:
  																				self.depth_first_search(node.right   ,							path_sum + node.right.value	)
  
  
  
  
  
  
  						def  _A			(					self   ,							_A   ,							_A = None	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													if node is None:
  																				return 0
  													if target is not None:
  																				__SCREAMING_SNAKE_CASE								=      target
  
  													self.depth_first_search(_A   ,							node.value	)
  													self.path_sum(node.left	)
  													self.path_sum(node.right	)
  
  													return self.paths
  
  
  if __name__ == "__main__":
  			import doctest
  
  			doctest.testmod()
  
  
  
  
  
  
  