input:

10000
15 14
13 12
5 4
9 8
11 12
15 14
10 9
14 13
2 3
2 1
6 5
10 11
3 4
7 6
8 7
6 5
2 1
2 4
4 6
2 3
3 5
10 9
8 3
9 4
5 6
5 10
3 2
5 4
2 7
1 2
4 3
2 1
2 1
2 1
2 1
9 8
9 8
5 4
1 2
6 5
3 4
3 2
7 8
7 6
2 1
1 2
14 13
3 10
5 6
2 9
11 4
2 3
2 1
8 7
13 6
5 4
5 12
6 7
4 3
7 14
16 15
2 3
2 1
6 10
6 9
6 4
9 11
...

output:

4
1 5 9 13 
2
1 6 
2
1 5 
1
1 
1
1 
3
1 4 7 
1
1 
2
1 5 
4
1 5 11 12 
1
1 
4
1 6 11 16 
2
1 4 
2
1 5 
3
1 9 11 
1
1 
4
1 5 9 13 
3
1 5 6 
1
1 
3
1 5 6 
1
1 
2
1 3 
2
1 4 
2
1 5 
3
1 11 12 
1
1 
4
1 5 9 13 
3
1 4 6 
3
1 5 9 
1
1 
1
1 
5
1 6 11 16 21 
3
1 6 10 
2
1 5 
4
1 7 13 16 
1
1 
2
1 4 
3
1 4 7 ...

result:

wrong answer Integer -1 violates the range [1, 3] (test case 54)