#include <bits/stdc++.h>
using namespace std;
int A[26], B[26];

int main() {
  string a, b;
  cin >> a >> b;
  for (size_t i = 0; i < a.size(); i++) {
    A[a[i] - 'a']++;
    B[b[i] - 'a']++;
  }
  for (int i = 0; i < 26; i++) {
    if (A[i] != B[i]) {
      cout << "NO" << endl;
      return 0;
    }
  }
  cout << "YES" << endl;
  return 0;
}