func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = 100010;   long long gcd(long long x, long long y) {     if (y == 0) return x;     return gcd(y, x % y);   }   int main() {     long long n;     cin >> n;     string s;     cin >> s;     vector<int> v(26);     for (long long i = 0; i < n; i++) {       v[s[i] -  a ]++;     }     for (long long i = 0; i < 26; i++) {       while (v[i]--) {         char c = i +  a ;         cout << c;       }     }     return 0;   }   