#include <algorithm>
#include <iostream>
#include <vector>
using namespace std;

int main() {
    string s; cin >> s;
    reverse(s.begin(), s.end());
    int cnt_w = 0;
    long long ans = 0;
    for (char c: s) {
        if (c == 'c') {
            ans += 1LL * cnt_w * (cnt_w - 1) / 2;
        } else if (c == 'w') {
            cnt_w++;
        }
    }
    cout << ans << endl;
    return 0;
}