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