As with the rest of the problems with no input, if you write a void output you get AC. It's a known bug in the judge (btw, not solvable for the moment...).
Please, don't use this bug to increase the number of AC problems. You'll get wrong submissions as soon as we fix this bug.
DON'T PM ME --> For any doubt, suggestion or error reporting, please use the "Contact us" form in the web.