matrix.txt

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