#23456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 @u='0335443554366887798866555766'=~/./g;$_+=<>;print"$_ is ",$_=$_-4?$_<20?$u[$_]||4:$u[chop]+$u[$_+18]:magic,".\n"until/a/