#include <iostream>
#include <iomanip>
#include <algorithm>
#include <vector>
#include <string>
#include <queue>
#include <map>
#include <stack>
#include <functional>
#include <complex>
#include <cmath>
#include <ccomplex>
using namespace std;

int main() {
	string a, b;
	cin >> a >> b;
	sort(a.begin(), a.end());
	sort(b.begin(), b.end());
	cout << (a == b ? "YES" : "NO") << endl;
}