#include <vector>
#include <queue>
#include <deque>
#include <stack>
#include <map>
#include <set>
#include <algorithm>
#include <functional>
#include <iostream>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <cctype>
#include <string>
#include <cstring>

using namespace std;

typedef long long ll;


int main() {
  string a;
  string b;
  cin >> a >> b;
  sort(a.begin(), a.end());
  sort(b.begin(), b.end());
  if (a == b) {
    cout << "YES" << endl;
  }else {
    cout << "NO" << endl;
  }
}