using System;
using System.Linq;

namespace No69
{
    class Program
    {
        static void Main(string[] args)
        {
            var A = Console.ReadLine();
            var B = Console.ReadLine();

            var Adic = A.ToLookup(c => c).ToDictionary(l => l.Key, l => l.Count());
            var Bdic = B.ToLookup(c => c).ToDictionary(l => l.Key, l => l.Count());

            var result = Adic.All(a =>
            {
                int tmp;
                return Bdic.TryGetValue(a.Key, out tmp)
                    ? a.Value == tmp
                    : false;
            })
            ? "YES" : "NO";

            Console.WriteLine(result);
        }
    }
}