func_code_string: #include <bits/stdc++.h>   using namespace std;   string s;   int ans, pre, cnt;   int main() {     cin >> s;     for (int i = 0; i < s.size(); i++) {       pre += s[i] -  0 ;       cnt++;       if (cnt == 3 || (s[i] -  0 ) % 3 == 0 || pre % 3 == 0)         ans++, pre = 0, cnt = 0;     }     cout << ans << endl;     return 0;   }   