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

public class Program
{
    public void Proc(){
        Reader.IsDebug = false;
        string strA = Reader.ReadLine();
        string strB = Reader.ReadLine();
        
        Dictionary<char, int> dicA = new Dictionary<char, int>();
        Dictionary<char, int> dicB = new Dictionary<char, int>();
        
        foreach (char c in strA)
        {
            if(dicA.ContainsKey(c)) {
                dicA[c]++;
            } else
            {
                dicA.Add(c, 1);
            }
        }
        foreach (Char c in strB) 
        {
            if(dicB.ContainsKey(c)) {
                dicB[c]++;
            } else
            {
                dicB.Add(c, 1);
            }
        }
        
        bool isMatch = true;
        foreach (Char key in dicA.Keys)
        {
            if(dicB.ContainsKey(key) && dicB[key] == dicA[key]) {
                
            } else
            {
                isMatch = false;
                break;
            }
        }
        Console.WriteLine(isMatch?"YES":"NO");
    }

    public static void Main(string[] args)
    {
        Program prg = new Program();
        prg.Proc();
    }
}

class Reader
{
    public static bool IsDebug = true;
    
    private static System.IO.StringReader sr;
    
    public static string ReadLine() {
        if(IsDebug) {
            if(sr == null) {
                sr = new System.IO.StringReader(initStr.Trim());
            }
            return sr.ReadLine();
        } else {
            return Console.ReadLine();
        }
    }
    
    public static int[] GetInt(char delimiter = ' ') {
        string[] inpt = ReadLine().Split(delimiter);
        int[] ret = new int[inpt.Length];
        for(int i=0; i<inpt.Length; i++) {
            ret[i] = int.Parse(inpt[i]);
        }
        return ret;
    }
    
    private static string initStr = @"

hurjztkyua
urjukzthua

    ";
}