#include<iostream>
#include<string>

int main() {
	std::string a, b;
	std::cin >> a >> b;

	int alpha[26] = { 0 };

	for (int i = 0; i < a.length(); i++) {
		alpha[a[i] - 'a']++;
		alpha[b[i] - 'a']++;
	}

	for (int i = 0; i < 26; i++) {
		if (alpha[i] % 2 == 1) {
			std::cout << "NO" << std::endl;
			return 0;
		}
	}

	std::cout << "YES" << std::endl;
	return 0;
}