#include <cstdio>
#include <iostream>
#include <string>
#include <vector>
#include <sstream>
#include <map>
#include <set>
#include <queue>
#include <algorithm>
#include <cmath>
#include <cstdlib>
#include <cstring>
#include <typeinfo>
#include <numeric>
#include <functional>
#include <unordered_map>
#include <bitset>


using namespace std;
using ll = long long;
using ull = unsigned long long;

const ll INF = 1e16;
const ll MOD = 1e9 + 7;

#define REP(i, n) for(int i = 0; i < n; i++)



int main() {
    string s;
    cin >> s;
    
    ll w = 0;
    REP(i, s.size()){
        if(s[i] == 'w')w++;
    }

    ll ans = 0;
    REP(i, s.size()){
        if(s[i] == 'c'){
            if(w & 1){
                ans += (w - 1) / 2 * w;
            }
            else{
                ans += w / 2 * (w - 1);
            }
        }
        else if(s[i] == 'w'){
            w--;
        }
    }
    
    cout << ans << endl;
}