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

using namespace std;

int main() {
	string s; cin >> s;
	auto cit = find(s.begin(), s.end(),'c');
	int ans = 0;

	while (true) {
		int wcnt = count(cit, s.end(), 'w');
		if (wcnt != 0) {
			ans += (wcnt*(wcnt - 1) / 2);
			cit = find(cit + 1, s.end(), 'c');
		} else {
			break;
		}
	}
	cout << ans << endl;
	return 0;
}