I found this problem on GP. It was post by the person that maintinas GP, so I just assumed that I was wrong and end up "correcting" my first answer into the wrong answer... arg =(

I apologize for my mistake, I will try to be more careful in the future.

I can't guarantee all of the stuff I post would be correct. In fact, I guarantee that I will make more mistakes ^^"

Thank you all for checking the stuff I post.

By the way, I am new to Sensei's library so I am not really sure how it works here; So far, I am just looking through pages and records and trying to do what other people here do.

In the future, should I just post my answers in the "attempts" and let somebody strong and experienced maybe like Unkx80 to move them to the solution pages...?