func_code_string: #include <bits/stdc++.h>   using namespace std;   int len, a, b, c;   string s;   int main() {     cin >> s;     len = s.length();     for (int i = 0; i < len; i++) {       if (s[i] ==  a )         a++, c++;       else         b++;       a = max(a, b);       b = max(b, c);     }     cout << a;     return 0;   }   