#include <iostream>
#include <string>

using namespace std;

int main() {
	string s;
	cin >> s;
	int wCount = 0;
	long long result = 0;
	for (int i = s.size() - 1; i >= 0; --i) {
		if (s[i] == 'w') {
			++wCount;
		}
		if (s[i] == 'c' && wCount >= 2) {
			result += wCount * (wCount - 1) / 2;
		}
	}
	cout << result << endl;
	return 0;
}