using System;
using System.Linq;

public class yukicoder{
    public static void Main(){
        char[] a = Console.ReadLine().ToCharArray();
        char[] b = Console.ReadLine().ToCharArray();
        
        Array.Sort(a);
        Array.Sort(b);
        
        string c = new string(a);
        string d = new string(b);
        string answer;
        
        if(c == d)
        {
            answer = "YES";
        }
        else
        {
            answer = "NO";
        }
        
        Console.WriteLine(answer);
        
    }
}