#include <bits/stdc++.h>
using namespace std;

int main() {
    string a,b;
    cin >> a >> b;
    sort(a.begin(),a.end());
    sort(b.begin(),b.end());
    if(a==b){
    	cout << "YES" << endl;
    }else{
    	cout << "NO" << endl;
    }
	return 0;
}