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

int main()
{
    string s;
    cin >> s;
    long cww = 0, w = 0;
    for (long i = s.size() - 1; i >= 0; i--) {
        if (s.at(i) == 'c') {
            cww += w * (w - 1) / 2;
        } else if (s.at(i) == 'w') {
            w++;
        }
    }
    cout << cww << endl;
}