#include<iostream>
#include<string>
#include<vector>

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

	// cとwだけの文字列にする
	for (int i = 0; i < s.length(); i++) {
		if (s[i] != 'c' && s[i] != 'w') {
			s.erase(s.begin() + i);
			i--;
		}
	}

	std::vector<long long> w(s.length());
	if (s.length() > 0 && s.back() == 'w') {
		w[s.length() - 1] = 1;
	} else if(s.length() > 0){
		w[s.length() - 1] = 0;
	}
	for (int i = s.length() - 2; i >= 0; i--) {
		w[i] = w[i + 1];
		if (s[i] == 'w') w[i]++;
	}

	long long ans = 0;
	for (int i = 0; i < s.length(); i++) {
		if (s[i] == 'c') {
			ans += (w[i] * (w[i] - 1)) / 2;
		}
	}

	std::cout << ans << std::endl;
	return 0;
}