#include <bits/stdc++.h>
typedef long long ll;
using namespace std;

int main()
{
    string s;
    cin >> s;
    ll w = 0,ans = 0;
    for(int i = s.length() - 1; i >= 0; i--){
        if(s[i] == 'w') w++;
        if(s[i] == 'c' && w > 1){
            ans += w * (w - 1) / 2;
        }
    }

    cout << ans << endl;

    return 0;
}