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

int main(){
    string s;
    cin >> s;
    ll w = 0, a = 0;
    for(ll i = s.size() - 1; i >= 0; i--){
        if(s[i] == 'c' && w != 0){
            a += w * (w - 1) / 2;
        }
        if(s[i] == 'w') w++;
    }
    cout << a << endl;
    return 0;
}