#include <bits/stdc++.h>

using namespace std;

int main() {
//	int cnt1[26] = {0}, cnt2[26] = {0};
	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;
	}
}