func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string s;     cin >> s;     int n = s.length();     int ans = 0;     int num = 0;     for (int i = 0; i < n; i++) {       if ((s[i] -  0 ) % 3 == 0) {         ans++;         num = 0;       } else {         num++;         if (num == 2) {           if ((s[i - 1] -  0  + s[i] -  0 ) % 3 == 0) {             ans++;             num = 0;           }         }         if (num == 3) {           ans++;           num = 0;         }       }     }     cout << ans << endl;     return 0;   }   