#include <iostream>
#include <cmath>
#include <vector>
#include <algorithm>

using namespace std;

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

string s;

int main(){
    while(cin >> s){
        int n = s.size();
        reverse(begin(s), end(s));
        int cntw = 0;
        long long ans = 0;
        rep(i,n){
            if(s[i] == 'w'){
                cntw++;
            } else if(s[i] == 'c'){
                ans += 1LL*cntw*(cntw-1)/2;
            }
        }
        cout << ans << endl;
    }
}