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

int main() {
	string s;
	cin >> s;
	int c,w;
	c = count(s.begin(), s.end(), 'c');
	w = count(s.begin(), s.end(), 'w');

	cout << (c-1 > w ? w : c - 1) << endl;
	return 0;
}