#include <algorithm>
#include <iostream>
#include <iomanip>
#include <cstring>
#include <string>
#include <vector>
#include <queue>
#include <cmath>
#include <stack>
#include <set>
#include <map>
typedef long long ll;
typedef unsigned int uint;
using namespace std;

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

	sort(a.begin(), a.end());
	sort(b.begin(), b.end());

	string ans;
	if (a == b) {
		ans = "YES";
	} else {
		ans = "NO";
	}
	cout << ans << endl;
}