#include <bits/stdc++.h>
using namespace std;

int main() {
	string s;
	cin>>s;
	int c=0,w=0;
	for (int i = 0; i < s.length(); ++i) {
		if(s[i]=='c'){c++;}
		else{w++;}
	}
	if(c<=w){cout<<c-1<<endl;}
	else{cout<<w<<endl;}
}