#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <iomanip>
#include <cmath>
using namespace std;
#define diff(x,y) ((x > y) ? (x - y) : (y - x))
#define us(x) (x > 0) ? x : x * -1

int main() {
	string a, b;
	cin >> a >> b;
	sort(a.begin(), a.end());
	sort(b.begin(), b.end());
	for (int i = 0; i < a.size(); i++) {
		if (a[i] != b[i]) {
			cout << "NO" << endl;
			return 0;
		}
	}
	cout << "YES" << endl;
	return 0;
}