#include <algorithm>
#include <iostream>
#include <string.h>
 
using namespace std; 
 
int main(){
  string a,b;
  cin>>a;
  cin>>b;
  sort(a.begin(),a.end());
  sort(b.begin(),b.end());
  if(a==b){
    cout<<"YES"<<endl;
  }
  else{
    cout<<"NO"<<endl;
  }
  return 0;
}