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

int main() {
  string A, B; cin >> A >> B;
  sort(A.begin(), A.end());
  sort(B.begin(), B.end());
  for(int i = 0; i < (int)A.size(); i++){
    if(A[i] != B[i]){
      cout << "NO" << endl;
      return 0;
    }
  }
  cout << "YES" << endl;
}