#include <bits/stdc++.h>
using namespace std;
int main(){
  string A;
  cin >> A;
  string B;
  cin >> B;
  sort(A.begin(), A.end());
  sort(B.begin(), B.end());
  if (A == B){
    cout << "YES" << endl;
  } else {
    cout << "NO" << endl;
  }
}