#include <bits/stdc++.h>
using namespace std;

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