#include<iostream>
#include<algorithm>

using namespace std;

int main(){
  string A,B;
  cin >> A >> B;
  sort(A.begin(), A.end());
  sort(B.begin(), B.end());
  if(A==B){
    cout << "YES" << endl;
  }else{
    cout << "NO" << endl;
  }
  return 0;
}