func_code_string: #include <bits/stdc++.h>   using namespace std;   char inc(char &c) {     char ret = c;     if (c ==  z )       c =  a ;     else       ++c;     return ret;   }   int main() {     int n;     cin >> n;     char t[4][n];     char c =  a ;     t[0][0] = t[1][0] = inc(c);     for (int i = 1; i < n; ++i) {       if (i % 2 == 0) {         t[0][i] = t[0][i - 1] = inc(c);         t[1][i] = t[1][i - 1] = inc(c);       } else {         t[2][i] = t[2][i - 1] = inc(c);         t[3][i] = t[3][i - 1] = inc(c);       }     }     if (n % 2 == 0)       t[0][n - 1] = t[1][n - 1] = inc(c);     else       t[2][n - 1] = t[3][n - 1] = inc(c);     for (int i = 0; i < 4; ++i) {       for (int j = 0; j < n; ++j) cout << t[i][j];       cout << endl;     }     cout << endl;   }   