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

namespace ForYukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            char[] A = Console.ReadLine().ToArray();
            char[] B = Console.ReadLine().ToArray();
            bool isMatch = true;

            Array.Sort(A);
            Array.Sort(B);

            for (int i = 0; i < A.Length; i++)
            {
                if (A[i] != B[i])
                {
                    isMatch = false;
                    break;
                }
            }

            Console.WriteLine(isMatch ? "YES" : "NO");
        }
    }
}