#include<iostream>
#include<vector>
#include<string>
#include<cstring>
#include<algorithm>
#include<map>
#include<set>

using namespace std;

int main() {
	string S;
	cin >> S;
	int C = count(S.begin(), S.end(), 'c');
	int W = count(S.begin(), S.end(), 'w');
	cout << min(C-1, W) << endl;
	return 0;
}