#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
// Welcome to my source code!

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