func_code_string: #include <bits/stdc++.h>   using namespace std;   bool pal(string& s) {     int j = s.size() - 1;     int i = 0;     while (i < j) {       if (s[i++] != s[j--]) return false;     }     return true;   }   int main() {     string s;     cin >> s;     int n = s.size();     for (int len = n; len >= 0; len--) {       for (int start = 0; start + len - 1 < n; start++) {         string sub = s.substr(start, len);         if (pal(sub))           continue;         else {           cout << len << endl;           return 0;         }       }     }     cout << 0 << endl;     return 0;   }   