#include <bits/stdc++.h>   using namespace std;   int main() {     string s;     int good = 0;     int bad = 0;     cin >> s;     for (int i = 0; i < s.length(); i++) {       if (s.at(i) ==  a )         good++;       else         bad++;     }     if (good > bad)       cout << s.length();     else       cout << s.length() - (bad - good) - 1;     return 0;   }   