/* -*- coding: utf-8 -*-
 *
 * 69.cc: No.69 文字を自由に並び替え - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

/* typedef */

/* global variables */

int as[26], bs[26];

/* subroutines */

/* main */

int main() {
  string a, b;
  cin >> a >> b;

  for (int i = 0; i < a.size(); i++) as[a[i] - 'a']++;
  for (int i = 0; i < b.size(); i++) bs[b[i] - 'a']++;

  bool same = true;
  for (int i = 0; same && i < 26; i++)
    same = (as[i] == bs[i]);

  cout << (same ? "YES" : "NO") << endl;
  return 0;
}