INPUT for Excercise 3:

3 6
0 a 1/1 0
0 b 0/1 1
1 a 1/1 0
1 b 1/1 2
2 a 0/1 1
2 b 1/1 2
2 3
0 a 1/3 0
0 b 1/3 0
0 - 1/3 1
E

Output:
5/4