#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll=long long;
using ld=long double;
ld pie=3.141592653589793;
ll inf=144494;
ll mod=1000000007;
int main(){
    string s;
    cin >> s;
    reverse(s.begin(),s.end());
    ll w=0;
    ll ans=0;
    for (ll i = 0; i < s.size(); i++)
    {
        if (s[i]=='c')
        {
            ans+=(w*(w-1))/2;
        }else if (s[i]=='w')
        {
            w+=1;
        }
    }
    cout << ans << endl;
}