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

int main(){
  string a;
  string 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;
}