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