9
0 4 0 0 0 5 8 0 0
0 0 2 8 3 1 0 0 0
0 0 0 0 9 0 3 0 5
0 1 0 0 0 0 9 4 0
8 3 0 0 1 0 0 5 6
0 2 9 0 0 0 0 7 0
7 0 5 0 8 0 0 0 0
0 0 0 1 5 9 4 0 0
0 0 1 2 0 0 0 3 0