#include <bits/stdc++.h> 
using namespace std;
#include <ios>
#include <iomanip>
#include <iostream>
#include <string>
#include <algorithm>

int main(){
  string a, b;
  cin >> a >> b;
  for(int j=0;j<26; j++){
    char fora = 'a'+j;
    int count = 0;
    int count2 =0;
  	for(int i=0; i<a.size(); i++){
        if(fora == a.at(i)){
          count++;
        }
    }
    for(int k=0; k<b.size(); k++){
         if(fora == b.at(k)){
           count2++;
         }
    }
    if(count==count2){
      if(j==25){
        cout << "YES";
    }
    }
    else{
      cout << "NO";
      break;
    }
  }
}