func_code_string: #include <bits/stdc++.h>   using namespace std;   string str;   int main() {     cin >> str;     bool chk = false;     for (int i = 0; i <= str.length(); i++) {       for (char ch =  a ; ch <=  z ; ch++) {         string temp1 = str.substr(0, i) + ch + str.substr(i);         string temp2 = temp1;         reverse(temp2.begin(), temp2.end());         if (temp1.compare(temp2) == 0) {           cout << temp1 << endl;           chk = true;           break;         }       }       if (chk == true) {         break;       }     }     if (chk == false) {       cout <<  NA n ;     }     return 0;   }   