I got AC when online contest was running.
But then rejudged,and I got WA.
Why un-derstand -> dnatsrednu
who can tell me clearly?

  Hi!

  I haven't solved it yet, but I think that:
 un-derstand --> nu-dnstsred.

  Or maybe it's a typo and and "-" sign shouldn't be there.

I had the same problem as you can see from my previous message.
I send my program, got Accept and then a day after that I got email
that the answer was rejudged and it is Wrong Answer now.

About "-" I really don't understand what they want.
What about online contest on which site is it?



> I got AC when online contest was running.
> But then rejudged,and I got WA.
> Why un-derstand -> dnatsrednu
> who can tell me clearly?