#include <iostream>

using namespace std;

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