or rather that guessing.....you could use a little common sence and try a little thing i like to call GOOGLE!!!!!!
XD XD XD
and if you already knew that...then why did you ask me how to do it?
there yar, what the numbers need to be, and what letter each one is XD
Google is an amazing tool!!!! and you'll find an answer yourslef a lot faster then you would on any forums!!!