#include <iostream>
#include <string>
using namespace std;

int main(){
   int acount[26] = {},bcount[26] = {};
   string a,b;
   cin >> a >> b;
   for(int i = 0;i < a.size();i++){
      acount[a[i] - 'a']++;
      bcount[b[i] - 'a']++;
   }
   for(int i = 25;i--;){
      if(acount[i] != bcount[i]){
         cout << "NO" << endl;
         return 0;
      }
   }
   cout << "YES" << endl;
}