#include <bits/stdc++.h>
using namespace std;
 
int main(){
   string A,B;
   cin>>A>>B;
   vector<int> alpha1(26,0),alpha2(26,0);
   for(int i=0;i<A.size();i++){
       int num1=A[i]-'a';
       int num2=B[i]-'a';
       alpha1[num1]++;
       alpha2[num2]++;
   }
   if(alpha1==alpha2){
       cout<<"YES"<<endl;
   }
   else{
       cout<<"NO"<<endl;
   }
}