#include <bits/stdc++.h>
using namespace std;
#define times(n, i) for (int i = 0; i < n; i++)
#define upto(n, m, i) for (int i = n; i <= m; i++)
#define downto(n, m, i) for (int i = n; i >= m; i--)
#define foreach(xs, x) for (auto &x : xs)
#define sortall(xs) sort(xs.begin(), xs.end())
#define reverseall(xs) reverse(xs.begin(), xs.end())

int bc(int n, int k)
{
    if (n < 0)
        return 0;
    if (n == k || k == 0)
        return 1;
    return bc(n-1, k-1) + bc(n-1, k);
}

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

    int wcnt = 0;
    int ans = 0;
    times(s.length(), i) {
        if (s[i] == 'w')
            wcnt++;
        else if (s[i] == 'c' && wcnt > 1) {
            ans += bc(wcnt, 2);
        }
    }

    cout << ans << endl;
    return 0;
}