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

typedef long long ll;

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

	string t;
	for (ll i = 0; i < s.length(); i++) {
		if (s[i] == 'c' || s[i] == 'w') {
			t.push_back(s[i]);
		}
	}

	ll n=t.length(), cntw=0;
	ll ans=0;
	for (ll i = n - 1; i >= 0; i--) {
		if (t[i] == 'w') {
			cntw++;
		}
		if (t[i] == 'c') {
			ans += cntw*(cntw-1)/2;
		}
	}

	cout << ans << endl;
}