func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string a, b, c;     int n;     cin >> n >> a;     sort(a.begin(), a.end());     for (int i = 0; i < a.size(); i += n) b += a[i];     for (int i = 0; i < n; i++) c += b;     b = c;     sort(b.begin(), b.end());     if (b != a)       cout << -1;     else       cout << c;     return 0;   }   