#include<bits/stdc++.h>
using namespace std;
int main(){
 string a,b;
 cin>>a>>b;
 int ca[26],cb[26];
 for(int i=0;i<26;i++){
  ca[i]=0;
  cb[i]=0;
 }
 for(int i=0;i<a.size();i++){
  ca[a[i]-'a']++;
  cb[b[i]-'a']++;
 }
 for(int i=0;i<26;i++){
  if(ca[i]!=cb[i]){
   cout<<"NO"<<endl;
   return 0;
  }
 }
 cout<<"YES"<<endl;
 return 0;
}