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