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

using namespace std;

int main() {
	string s, t;
	cin >> s;

	long long nw = 0;
	int n = s.size();
	for (int i = 0; i < n; i++) {
		if (s[i] == 'w') {
			nw++;
		}
	}

	long long ans = 0;
	for (int i = 0; i < n; i++) {
		if (s[i] == 'w') {
			nw--;
		} else if (s[i] == 'c') {
			ans += nw * (nw - 1) / 2;
		}
	}
	cout << ans << endl;
	return 0;
}