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

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