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

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