#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;

int main(int argc, char**argv)
{
	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;
}