#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  string S, T;
  cin >> S >> T;
  vector<int> cnts(26, 0), cntt(26, 0);
  for (char s : S) {
    cnts[s - 'a']++;
  }
  for (char t : T) {
    cntt[t - 'a']++;
  }
  if (cnts == cntt) {
    cout << "YES" << '\n';
  } else {
    cout << "NO" << '\n';
  }
  return 0;
}