题解后面补，先放个c++的

#include <algorithm>
#include <iostream>
#include <string>
using namespace std;

int flag=1;

bool f(string s, string t) {
    if(flag==0)return false;
    if (s == t)
        return true;
    string b=t;
    reverse(b.begin(), b.end());
    if (s == b)
        return true;
    int l1=s.length(),l2=t.length();
    if(l1%2==0)return f(s.substr(0,l1/2),t.substr(0,l2/2))&&f(s.substr(l1/2,l1/2),t.substr(l2/2,l2/2));
    return false;
}

int main() {
    string s, t;
    cin >> s >> t;
    if (f(s, t)) {
        cout << "YES" << endl;
    } else {
        cout << "NO" << endl;
    }
    return 0;
}