$z=!pop;sub g{$x||=($c=getc,$z?8:1);vec$c,--$x,1}sub I{my$i=pop;sub{my$c;($B[$i]||=defined($c=getc)?sub{pop->($z?b($c,8):a($c))->(I($i+1))}:sub{sub{pop}})->(pop)}}sub P{if(g()){my$i;$i++while g();sub{$_[$i]}}elsif(g()){my$p=P();my$q=P();sub{my@a=@_;$p->(@a)->(sub{$q->(@a)->(pop)})}}else{my$p=P();sub{my@a=@_;sub{$p->(pop,@a)}}}}sub e{pop->(sub{0})->(sub{1})->()}$|=1;sub d{my$x=pop;pop->(sub{$x=2*$x+e(pop);sub{my$r=pop;sub{d($r,$x)}}})->(chr$x)}sub O{pop->(sub{print($z?d(pop,0):e(pop));sub{my$r=pop;sub{O($r)}}})->("\n")}sub b{my($c,$x)=@_;sub{$x--?pop->(a(vec$c,$x,1))->(b($c,$x)):sub{pop}}}sub a{my$c=pop;sub{my$x=pop;sub{$c?pop:$x}}}print O P()->()->(I(0))