#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, e) for (int i = (int)s; i < (int)e; ++i)
#define all(a) (a).begin(), (a).end()

int main() {
    cin.tie(nullptr);
    
    string S;
    cin >> S;
    int siz = S.size();
    
    vector<ll> dp(3, 0);
    
    rep(i, 0, siz) {
        if (S[i] == 'c') dp[0]++;
        if (S[i] == 'w') {
            dp[2] += dp[1];
            dp[1] += dp[0];
        }
    }
    
    cout << dp[2] << '\n';
}