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

int main() {
	string S, T;
	long long COUNT = 0, ANS = 0;
	cin >> S;
	for (int i = 0; i < S.size(); i++) {
		if (S[i] == 'c' || S[i] == 'w') T = T + S[i];
	}
	reverse(T.begin(), T.end());
	for (int i = 0; i < T.size(); i++) {
		if (T[i] == 'c') {
			ANS += COUNT * (COUNT - 1) / 2;
		}
		else {
			COUNT++;
		}
	}
	cout << ANS << endl;
}