def find_empty(input_board):
    """[Finds the 0 values present in the input list]

    Args:
        input_board ([type: List]): [9 by 9 2D list]

    Returns:
        [type: None]: [returns the co ordinate if 0 present else retunrs Nonr]
    """
    for i in range(len(input_board)):
        for j in range(len(input_board[0])):
            if input_board[i][j] == 0:
                return (i, j)
    return None
    # End of find_empty function