// driver program for Sudoku class
   import java.io.*;
   import java.util.Scanner;

   public class SudokuMain
   {
      public static void main(String[] args) throws IOException
      {
         Sudoku puzzle = new Sudoku();
      
         Scanner keyboard = new Scanner(new InputStreamReader(System.in));
         System.out.println("Please enter the name of a file containing a 9x9 Sudoku solution:");
         puzzle.read(keyboard.nextLine());
         puzzle.print();
      
         System.out.println("Grid validity: " + puzzle.validate());
      
      }
   }