#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    string S; cin >> S;
    ll c = 0, w = 0, n = S.size();
    rep(i,n) if(S[i] == 'w') w++;

    ll ans = 0;
    rep(i,n) {
        if(S[i] == 'w') {
            w--;
            ans += c * w;
        }
        if(S[i] == 'c') c++;
    }
    cout << ans << endl;
}