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

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;
}