#include <bits/stdc++.h>

using namespace std;

int main() {
    string a, b;
    cin >> a >> b;
    sort(a.begin(), a.end());
    sort(b.begin(), b.end());
    if (a == b) {
        cout << "YES" << endl;
    } else {
        cout << "NO" << endl;
    }
    return 0;
}