/*
 * 69.cpp
 *
 *  Created on: 2017/08/26
 *      Author: pinebooks
 */

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int main() {
  string A, B;
  cin >> A >> B;
  if (A.size() != B.size()) {
    cout << "NO" << endl;
    return 0;
  }
  sort(A.begin(), A.end());
  sort(B.begin(), B.end());
  if (A == B)
    cout << "YES" << endl;
  else
    cout << "NO" << endl;
  return 0;
}