I wonder if it's true that the first test matches the sample. My program writes 'Yes' just like in the sample.
But it gets WA1 ??

Will anyone answer my question?

Many people have such problems because they don't skeep symbols #10 and #13.
Send me your code (sk1@hotbox.ru) and I'll try to help you.

PS: If you have WA #1 it is not a reason to ask for JUDGES' help.

I am not asking for judges' help. I just want to know why my program gets WA. It's really annoying to have WA1 without an obvious reason.

Thanks in advance.

MB you output some additional adta?

In this judge the first test isn't necessarily equal to the first example. Some problems only have few large tests.