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