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

using namespace std;

int main() {
	string a, b;
	vector<int> aaa(26, 0), bbb(26, 0);

	cin >> a >> b;

	for (int i = 0; i < a.size(); i++) {
		aaa[a[i] - 'a']++;
		bbb[b[i] - 'a']++;
	}

	cout << (aaa == bbb ? "YES" : "NO") << endl;
	return 0;
}