using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace algo {
    class Program
    {
        static void Main(string[] args)
        {
            char[] A = Console.ReadLine().ToCharArray(); //Console.ReadLine().Split(' ');
            char[] B = Console.ReadLine().ToCharArray();
            Array.Sort(A);
            Array.Sort(B);
            for(int i = 0; i < A.Length; i++)
            {
                if(A[i] != B[i])
                {
                    Console.WriteLine("NO");
                    return;
                }
            }
            Console.WriteLine("YES");
        }
    }
}