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