10 3 20
8 0 0 0 0 0 0 0 0 8
0 0 0 1 0 9 0 0 9 1
a 3 8
a 3 0
a 10 0
b 1 8
a 2 0
a 6 8
a 5 0
b 3 8
a 7 8
a 10 9
a 7 0
b 1 1
a 2 0
b 4 8
a 8 0
a 4 9
b 9 8
b 9 9
b 9 9
b 6 9