<?php

fscanf(STDIN , "%s", $line_1);
fscanf(STDIN , "%s", $line_2);

$line1 = str_split($line_1);
$line2 = str_split($line_2);

$line_all = array_merge($line1, $line2);

$count = array_count_values($line_all);

$count_key = count($count);

$Ok = true;

foreach($count as $key => $value){
    for($i = 0; $i <= $key; $i ++){
        if($value == 1 or $value % 2 == 1){
           $Ok = false;
           break;
        }else{
            $Ok = true;
        }
    }
}

if($Ok === false){
    echo "NO\n";
}else{
    echo "YES\n";
}