#include <vector>
#include <list>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <algorithm>
#include <sstream>
#include <iostream>
#include <string>
#include <cstdio>
#include <cmath>

using namespace std;

int main() {

	string S;
	cin >> S;

	int c=0, w=0;
	for (int i = 0; i < S.size(); i++) {
		if (S[i] == 'c') c++;
		if (S[i] == 'w') w++;
	}

	cout << min(c-1, w)<<endl;

	return 0;
}