




import itertools




def  a_		(							__snake_case					)	->			Optional[int]:

			'''simple docstring'''


			return (
			    int(''.join(combination[0:2]					)					) * int(''.join(combination[2:5]					)					)
			    == int(''.join(combination[5:9]					)					)
			) or (
			    int(''.join(combination[0]					)					) * int(''.join(combination[1:5]					)					)
			    == int(''.join(combination[5:9]					)					)
			)




def  a_		(							)	->			str:

			'''simple docstring'''


			return sum(
			    {
			        int(''.join(pandigital[5:9]					)					)
			        for pandigital in itertools.permutations('123456789'					)
			        if is_combination_valid(__snake_case					)
			    }					)


if __name__ == "__main__":
				print(solution())






def  a_		(							__snake_case					)	->			str:

			'''simple docstring'''


			return " ".join([word[::-1] for word in input_str.split()]					)


if __name__ == "__main__":
				import doctest

				doctest.testmod()
