using System;

class S19_chech2Arrays{
  public static int Main(string[] args){
    char[] a = Console.ReadLine().ToCharArray();
    char[] b = Console.ReadLine().ToCharArray();
    string ans = "YES";

    Array.Sort(a);
    Array.Sort(b);

    for(int i = 0; i < a.Length; i++){
      if(!(a[i].Equals(b[i]))){
        ans = "NO";
        break;
      }
    }

    Console.WriteLine(ans);

    return 0;
  }
}