#include <bits/stdc++.h>
#define rep(i, ss, ee) for (int i = ss; i < ee; ++i)
using namespace std;

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