#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int main() {
	string s;
	cin >> s;
	vector<int> sum(s.size());
	sum[0] = 0;
	for (int i = 1;i < s.size();i++) {
		sum[i] = sum[i - 1];
		if (s[i] == 'w') {
			sum[i]++;
		}
	}

	ll ans = 0;
	for (int i = 0;i < s.size();i++) {
		if (s[i] == 'c') {
			ll numm = sum[s.size()-1] - sum[i];
			ans += numm*(numm-1)/2;
		}
	}
	cout << ans << endl;
	return 0;
}