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

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