#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

using namespace std;

int main(){
  string a,b;
  cin >> a;
  cin >> b;
  
  vector<int> av,bv;

 
  for(int i=0;i<a.size();i++){
    av.push_back((int)a[i]);
  }
  for(int i=0;i<b.size();i++){
    bv.push_back((int)b[i]);
  }
  
  sort(av.begin(), av.end());
  sort(bv.begin(), bv.end());
  
  bool flag = true;
  for (int i=0;i<av.size();i++){
    if(av[i] != bv[i]){
      cout << "NO" << endl;
      flag = false;
      break;
    }
  }
  
  if(flag){
    cout << "YES" << endl;
  }
}