#include <iostream>

int main() {
    std::string s;
    long long int c = 0, w = 0;
    std::cin >> s;
    for (int i = s.length(); i >= 0; i--)
        if (s[i] == 'c') c += w * (w - 1) / 2; // wC2
        else if (s[i] == 'w') w += 1;
    std::cout << c << std::endl;
    return 0;
}