#include <bits/stdc++.h>

using namespace std;

#define INF 2000000000
#define MOD 1000000007
typedef long long ll;
typedef pair<int, int> P;


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

	ll numw=0;
	ll sum=0;
	for (int i = s.size()-1; i >= 0; i--) {
		if (s[i]=='c') {
			if (numw>=2) {
				sum+=numw*(numw-1)/2;
			}
		} else if (s[i]=='w') {
			numw++;
		}
	}
	cout << sum << "\n";

}