#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define llong long long

int main() {
    string s;
    cin >> s;

    reverse(s.begin(), s.end());
    llong result = 0;
    int ccnt = 0;
    int wcnt = 0;
    for(char c: s) {
        if(c == 'w') {
            wcnt += 1;
        } else if(c == 'c') {
            if(wcnt>=2) {
                result += (llong)wcnt * (wcnt-1) / 2;
            }
        }
    }

    cout << result << "\n";
}