#include <iostream>
#include <cmath>
#include <string>
#include <vector>
#include <map>
#include <algorithm>

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;

	//int stringSpan = a.size();
	//for (int i = 0; i <= stringSpan; i++) {
	//	for (int j = 0; j < stringSpan; j++) {
	//		if (a[i] == b[j]) {
	//		}
	//	}
	//}
	return 0;
}