#include <bits/stdc++.h>
#define fastIO (cin.tie(0), cout.tie(0), ios::sync_with_stdio(false))
#define precise(i) fixed << setprecision(i)
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
using namespace std;

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

  sort(a.begin(), a.end());
  sort(b.begin(), b.end());
  cout << (a == b ? "YES" : "NO") << '\n';
}