#include<bits/stdc++.h>
typedef long long ll;
using namespace std;
int INF = 1LL << 30;
int MOD = 1e9+7;
main(){
    string S;
    cin >> S;
    ll cnt = 0,ans = 0;
    reverse(S.begin(),S.end());
    for(auto c:S){
        if(c == 'c' && cnt) ans += cnt * (cnt-1) / 2;
        else if(c == 'w')   cnt++;
    }
    cout << ans << endl;
}