<>;
while(<>){
	$_=<>;
	if(/helloworld/){
	}elsif(/.*\K[h?][e?][l?][l?][o?][w?][o?][r?][l?][d?]/){
		@a=();
		$a=$_;
		$p=@-[0];
		for$i($p-10..$p){
			if($i>=0){
				$_=$a;
				pos=$i;
				if(s/\G[h?][e?][l?][l?][o?][w?][o?][r?][l?][d?]/helloworld/){
					push@a,$_;
				}
			}
		}
		($_)=sort@a;
	}else{
		$_="-1\n";
	}
	y/?/a/;
	print;
}