5 9 9 9 9 9 9 9 4 0 X
0 5 9 9 9 9 9 9 9 4 X
0 0 5 9 9 9 9 9 9 9 4 0 X
0 0 0 5 9 9 9 9 9 9 9 4 X
Q
Z
M