10
 0 4 3 10 0 0 0 0 18 0
 4 0 1  0 5 0 0 0  0 0
 3 1 0  9 5 0 0 0  0 0
10 0 9  0 7 8 0 9  8 0
 0 4 5  7 0 9 9 0  0 0
 0 0 0  8 9 0 2 2  0 0
 0 0 0  0 9 2 0 4  0 6
 0 0 0  9 0 2 4 0  9 3
18 0 0  8 0 0 0 9  0 9
 0 0 0  0 0 0 6 3  9 0