http://qs1969.pair.com?node_id=11590

#!/usr/bin/perl -w # there can be only one use strict; $_='$_={one(( one($")<<1)^one( $/))}{{one((one($;) <<($^=(one($/)>>1)>>1) +1)+one($/)>>1)}{{{one((( one($;)<<$^+1)+one($/)>>1)-$ ^)}{{{one(((one($;)<<$^+1)+one( $/)>>1)-1)}{one (one($"))}{{one ((one($;)<<$^)^ (one($")>>1)+1) }{one((one($;)< <$^)-$^)}{{one( ((one($;)<<$^)- $^)+1)}}{one((( one($;)<<$^+1)+ one($/)>>1)-1)} {one(($~=$=)<<1 ^one($")>>1)}{{ {one((one($;)<< $^)-one($/)-1)} {one(((one($;)< <$^+1)+one($/)> >1)-$^-1)}{one( one($"))}}{one( one($/)<<$^+1)} {one((one($;)<< $^)-one($/)-1)} {one(((one($;)< <$^+1)+one($/)> >1)-$^-1)}}}{{{one(((one($;)<<$^)-$^)-$^)}}}{one( one($"))}}{one(($~=$=)<<1^one($")>>1)}}{{one((one ($;)<<$^)-(one($")>>1)+1)}{one((one($;)<<$^)-(one ($")>>1)+$^+1)}}{{one(($~=$=)<<1^(one($")>>1)+$^+ 1)}{one((one($;)<<$^)-one($/)-1)}{one(((one($;)<< $^+1)+one($/)>>1)-$^-1)}}{one($=^(one($")>>1))';s ;{one;chr;g;y;{ne}}\012\040;.rd.;sd;eval;print;#1