Sudoku 9 x 9

Program is solving sudoku problems

For example:
A = [1 0 0 0 0 0 0 0 0;
0 0 4 0 0 5 0 0 9;
0 0 0 8 0 1 0 7 0;
0 6 1 0 0 0 0 0 5;
9 0 0 7 0 4 0 0 3;
2 0 0 0 0 0 4 9 0;
0 4 0 5 0 8 0 0 0;
7 0 0 2 0 0 3 0 0;
0 0 0 0 0 0 0 0 1];
And the program instead of zeros give the right values.