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