1   1   5
1   2   4
1   4   2
2   1   5
2   2   6
2   3   5

1   1   5
1   2   4
1   3   0
1   4   2
1   5   0
2   1   5
2   2   6
2   3   5
2   4   0
2   5   0

with open('test.sum') as f:
    check = 0
    for line in f:
        if int(line.split()[1]) == check + 1:
            check = int(line.split()[1])
            print line.rstrip()
        else:
            check = int(line.split()[1])
            print int(line.split()[1]) - 1, 't0'
            print line.rstrip()
    print int(line.split()[1]) + 1, 't0'
    print int(line.split()[1]) + 2, 't0'