


from __future__ import annotations

__UpperCamelCase				:  Optional[Any]      					=							list[list[int]]

# assigning initial values to the grid
__UpperCamelCase				:  Matrix      					=							[
    [3, 0, 6, 5, 0, 8, 4, 0, 0],
    [5, 2, 0, 0, 0, 0, 0, 0, 0],
    [0, 8, 7, 0, 0, 0, 0, 3, 1],
    [0, 0, 3, 0, 1, 0, 0, 8, 0],
    [9, 0, 0, 8, 6, 3, 0, 0, 5],
    [0, 5, 0, 0, 9, 0, 6, 0, 0],
    [1, 3, 0, 0, 0, 0, 2, 5, 0],
    [0, 0, 0, 0, 0, 0, 0, 7, 4],
    [0, 0, 5, 2, 0, 6, 3, 0, 0],
]

# a grid with no solution
__UpperCamelCase				:  Matrix      					=							[
    [5, 0, 6, 5, 0, 8, 4, 0, 3],
    [5, 2, 0, 0, 0, 0, 0, 0, 2],
    [1, 8, 7, 0, 0, 0, 0, 3, 1],
    [0, 0, 3, 0, 1, 0, 0, 8, 0],
    [9, 0, 0, 8, 6, 3, 0, 0, 5],
    [0, 5, 0, 0, 9, 0, 6, 0, 0],
    [1, 3, 0, 0, 0, 0, 2, 5, 0],
    [0, 0, 0, 0, 0, 0, 0, 7, 4],
    [0, 0, 5, 2, 0, 6, 3, 0, 0],
]
def      snake_case_						( __lowercase			,       __lowercase			,       __lowercase			,       __lowercase       ):
   for i in range(9       ):
      if grid[row][i] == n or grid[i][column] == n:
         return False

   for i in range(3       ):
      for j in range(3       ):
         if grid[(row - row % 3) + i][(column - column % 3) + j] == n:
            return False

   return True
def      snake_case_						( __lowercase       ):
   for i in range(9       ):
      for j in range(9       ):
         if grid[i][j] == 0:
            return i, j
   return None
def      snake_case_						( __lowercase       ):
   if location := find_empty_location(__lowercase       ):
      UpperCAmelCase_		,      UpperCAmelCase_							:      Dict						=   location
   else:
      # If the location is ``None``, then the grid is solved.
      return grid

   for digit in range(1			,       1_0       ):
      if is_safe(__lowercase			,       __lowercase			,       __lowercase			,       __lowercase       ):
         UpperCAmelCase_							:      Optional[Any]						=   digit

         if sudoku(__lowercase       ) is not None:
            return grid

         UpperCAmelCase_							:      Union[str, Any]						=   0

   return None
def      snake_case_						( __lowercase       ):
   for row in grid:
      for cell in row:
         print(__lowercase			,       end=''' '''       )
      print()


if __name__ == "__main__":
       # make a copy of grid so that you can compare with the unmodified grid
       for example_grid in (initial_grid, no_solution):
              print('\nExample grid:\n' + '=' * 20)
              print_solution(example_grid)
              print('\nExample grid solution:')
              __UpperCamelCase				:  int      					=							sudoku(example_grid)
              if solution is not None:
                     print_solution(solution)
              else:
                     print('Cannot find a solution.')



def      snake_case_						( __lowercase       ):
   return " ".join(
       ''''''.join(word[::-1]       ) if len(__lowercase       ) > 4 else word for word in sentence.split()       )


if __name__ == "__main__":
       import doctest

       doctest.testmod()
       print(reverse_long_words('Hey wollef sroirraw'))