#include <bits/stdc++.h>

//const static double	de_PI	= 3.14159265358979323846;
//const static int	de_MOD	= 1000000007;
//const static int	de_MAX	= 999999999;
//const static int	de_MIN = -999999999;

inline double nCr(const int n, int r) {

	if (n == 0) { return 0; }
	if (r == 0) { return 1; }
	if (r == 1) { return n; }
	if (n == r) { return 1; }

	if (r > n / 2) { r = n / 2; }

	double result = 1;
	for (double i = 1; i <= r; i++) {
		result *= (n - i + 1) / i;
	}

	return(result);
}
int main(void) {

	//std::ifstream in("123.txt");	std::cin.rdbuf(in.rdbuf());

	std::string S;
	std::cin >> S;

	double ans = 0;
	int st = 0, n = 0;

	while (S.find('c', st) != std::string::npos) {
		st = S.find('c', st) + 1;
		n = std::count(S.begin() + st, S.end(), 'w');
		if (n >= 2) { ans += nCr(n, 2); }
		else { break; }
	}

	std::cout << std::setprecision(20) << ans << std::endl;
}