#include <iostream>
#include <string>
#include <algorithm>
using namespace std;

int main()
{
	string s; cin >> s;
	int cntc = 0,cntw=0;
	for (int i = 0; i < s.size(); i++) {
		if (s[i] == 'c')cntc++;
		else {
			cntw++;
		}
	}

	cout << min(cntc-1, cntw) << endl;

    return 0;
}