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