#define _USE_MATH_DEFINES
#include<stdio.h>
#include<string>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include<iomanip>

//#include<bits/stdc++.h>



using namespace std;




int main() {
	string p;
	cin>>p;
	int a=0,b=0;
	for(int i=0;i<p.size();i++){
		if(p[i]=='c')a++;
		else b++;
	}
	cout<<min(a-1,b)<<endl;
	
		

	return 0;
}