<?php
$a = str_split(trim(fgets(STDIN)));
$b = str_split(trim(fgets(STDIN)));
sort($a);
sort($b);
$n = count($a);
foreach($a as $key => $val){
if($val != $b[$key]){
echo "NO\n";
break;
}else{
$n -= 1;
if($n == 0){
echo "YES\n";
}
}
}