#include <iostream>
#include <vector>
#include <cstdio>
#include <sstream>
#include <map>
#include <string>
#include <algorithm>
#include <queue>
#include <cmath>

using namespace std;


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