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

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

    long long ans = 0;
    for (int i = 0; i < str.size(); i++) {
        long long tmp = w[str.size()] - w[i];
        if (c[i] && tmp >= 2) {
            ans += (long long)(tmp * (tmp - 1) / 2);
        }
    }

    cout << ans << endl;

    return 0;
}