in reply to No alpha-num

This doesn't work on Mac OS X since
some of the error messages are different.
However, the following modification works on Mac OS X.
$_=++$_*++$_*++$_;($:)=($!=$*=$~=--$_)=~/^(.).*$/;--$*;$*--;$;=$:;($:) +=($!=$_+=++$_)=~/^(.).*$/;--$*;$*--;$;=$;.$:;$_++;$_++;($:)=($!=++$_) +=~/^(.).*$/;--$*;$*--;$;=$;.$:;--$_;--$_;($:)=($!=$_+=++$_-(++$~))=~/ +^(.)/;$;=$;.$:;$_+=++$~;($:,$~)=($!=$_+=$~)=~/^...(.)(.).*$/;$,=$:.$~ +;($:,$~)=($!=--$_)=~/^.* (.)(.).*$/;$,.=$:.$~;$_/=$_;$|=$_++;`$, $; $ +|>&$_`