using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace YukiCoder
{
    class Program
    {
        static void Main(string[] args)
        {
            var va = Console.ReadLine().OrderBy(c => c).ToArray();
            var vb = Console.ReadLine().OrderBy(c => c).ToArray();
            string sa = new string(va);
            string sb = new string(vb);
            if (string.Compare(sa, sb) == 0)    Console.WriteLine("YES");
            else                                Console.WriteLine("NO");
            Console.ReadLine();
        }
    }
}