
from functools import lru_cache






@lru_cache
def  a_	( __lowercase     :			int				)				->						int:
			if not isinstance(__lowercase ,      __lowercase				):
						raise TypeError('k must be an integer.'				)
			if k < 0:
						raise ValueError('k integer must be greater or equal to zero.'				)
			if k == 0:
						return 0
			elif k == 1:
						return 1
			else:
						return fibonacci(k - 1				) + fibonacci(k - 2				)






def  a_	( __lowercase     :			list ,      __lowercase     :			int				)				->						int:
			_snake_case						=    len(__lowercase				)
			# Find m such that F_m >= n where F_i is the i_th fibonacci number.
			_snake_case						=    0
			while True:
						if fibonacci(__lowercase				) >= len_list:
									_snake_case						=    i
									break
						i += 1
			_snake_case						=    0
			while fibb_k > 0:
						_snake_case						=    min(
						    offset + fibonacci(fibb_k - 1				) ,      len_list - 1				)  # Prevent out of range
						_snake_case						=    arr[index_k]
						if item_k_1 == val:
									return index_k
						elif val < item_k_1:
									fibb_k -= 1
						elif val > item_k_1:
									offset += fibonacci(fibb_k - 1				)
									fibb_k -= 2
			else:
						return -1


if __name__ == "__main__":
			import doctest

			doctest.testmod()

import random
import sys

_lowerCamelCase :       Tuple     					=    '''ABCDEFGHIJKLMNOPQRSTUVWXYZ'''






def  a_	( )				->						None:
			_snake_case						=    input('Enter message: '				)
			_snake_case						=    'LFWOAYUISVKMNXPBDCRJTQEGHZ'
			_snake_case						=    input('Encrypt/Decrypt [e/d]: '				)

			check_valid_key(__lowercase				)

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

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






def  a_	( __lowercase     :			str				)				->						None:
			_snake_case						=    list(__lowercase				)
			_snake_case						=    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     :			str ,      __lowercase     :			str				)				->						str:
			return translate_message(__lowercase ,      __lowercase ,      'encrypt'				)






def  a_	( __lowercase     :			str ,      __lowercase     :			str				)				->						str:
			return translate_message(__lowercase ,      __lowercase ,      'decrypt'				)






def  a_	( __lowercase     :			str ,      __lowercase     :			str ,      __lowercase     :			str				)				->						str:
			_snake_case						=    ''
			_snake_case						=    LETTERS
			_snake_case						=    key

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

			for symbol in message:
						if symbol.upper() in chars_a:
									_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  a_	( )				->						str:
			_snake_case						=    list(__lowercase				)
			random.shuffle(__lowercase				)
			return "".join(__lowercase				)


if __name__ == "__main__":
			main()