func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t;     t = 1;     for (int r = 0; r < t; r++) {       long long n, m, i, x, y, z, sum = 0;       cin >> n >> m;       vector<string> v(51);       char a =  a , b =  A ;       for (i = 0; i <= 50; i++) {         if (b >  Z ) b =  A ;         v[i].push_back(b);         if (i >= 26) {           v[i].push_back(a);           a++;         }         b++;       }       x = 0, y = 0;       vector<string> ans;       string temp;       while (y < m - 1) {         ans.push_back(v[y]);         y++;       }       x = y;       for (i = 0; i < (n - m + 1); i++, x++) {         cin >> temp;         if (temp ==  NO ) {           ans.push_back(ans[x - (m - 1)]);         } else {           ans.push_back(v[y]);           y++;         }       }       for (i = 0; i < n; i++) cout << ans[i] <<    ;       cout <<   n ;     }     return 0;   }   