using System;
using System.IO;
using System.Linq;

namespace yukicore
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            var n = Console.ReadLine().ToCharArray();
            var m = Console.ReadLine().ToCharArray();
            Array.Sort(n);
            Array.Sort(m);

            for (int i = 0; i < n.Length; i++)
            {
                if (n[i] != m[i])
                {
                    Console.WriteLine("NO");
                    return;
                }
            }

            Console.WriteLine("YES");
        }
    }
}