#include <iostream>
#include <string>
using namespace std;
int main(){
	string S;
	cin >> S;
	int N = S.size();
	long long cnt = 0;
	long long ans = 0;
	for (int i = N - 1; i >= 0; i--){
		if (S[i] == 'w'){
			cnt++;
		}
		if (S[i] == 'c'){
			ans += cnt * (cnt - 1) / 2;
		}
	}
	cout << ans << endl;
}