#include <iostream>
#include <string>
#include <algorithm>

using namespace std;

int main() {
	string s;
	cin >> s;
	int countOfC = 0;
	for (int i = 0; s[i] == 'c' && i < s.size(); ++i) {
		++countOfC;
	}
	int countOfW = 0;
	for (int i = s.size() - 1; s[i] == 'w' && i >= 0; --i) {
		++countOfW;
	}
	cout << min(countOfC - 1, countOfW) << endl;
	return 0;
}