#include<iostream>
#include<algorithm>
#include<stdio.h>
#include<stdlib.h>
#include<vector>
#include<string>
#include<sstream>
using namespace std;


int main(){

  string a,b;
  cin >> a;
  cin >> b;

  sort(a.begin(),a.end());
  sort(b.begin(),b.end());

  if(a==b) cout << "YES" << endl;
  else cout << "NO" << endl;

  return 0;
}