func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, k;     string out, chr;     cin >> n >> k;     for (int i = 0; i < k; ++i) chr +=  a  + i;     for (int i = 0; i < n; ++i) out += chr[i % k];     cout << out;     return 0;   }   