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