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

namespace template
{
    class Program
    {
        static void Main(string[] args)
        {
            char[] a = Console.ReadLine().ToCharArray(); Array.Sort(a);
            char[] b = Console.ReadLine().ToCharArray(); Array.Sort(b);
            bool flag = true;
            for (int i = 0; i < a.Length; i++)
            {
                if (a[i] != b[i]) flag = false;
            }
            Console.WriteLine(flag ? "YES" : "NO");
        }
    }
}