#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());
   if(a == b ){
     cout << "YES" << endl;
   }
   else{
     cout << "NO" << endl;
   }
  }