1 1
1 10
1 20
1 2
100 300
100 100
200 2000
50000 60000
100000 100001
1 100000
1 400000
300000 399999
300000 399998
300011 399989
122 123
1232 1400
1111 1111
11111 11112
11113 31231
300000 320000
2 400000
4 399999
5 398888
2323 343234
324032 393234
33 350000
44 300000
55 250000
66 200000
77 150000
3000000 3999999
3000000 3999998
3000011 3999989
1 4000000
0 0