#include <bits/stdc++.h>

//const static double	de_PI	= 3.14159265358979323846;
//const static int	de_MOD	= 1000000007;
//const static int	de_MAX	= 999999999;
//const static int	de_MIN = -999999999;

int main(void) {

	//std::ifstream in("123.txt");	std::cin.rdbuf(in.rdbuf());	

	std::string S;
	std::cin >> S;

	int c = std::count(S.begin(), S.end(), 'c');
	int w = S.length() - c;

	if (c - 1 > w) {
		std::cout << w << std::endl;
	}
	else {
		std::cout << c - 1 << std::endl;
	}

}