#include<iostream>
#include<string>

using namespace std;

int main() {
	string s, ss;
	int i = 0, j = 0, n, a = 0, ll = 0;
	long l = 0;

	cin >> s;
	l = s.length();

	for (i = 0; i < l; i++) {
		if (s[i] == 'c') {
			ss += 'c';
		}
		else if (s[i] == 'w') {
			ss += 'w';
		}
	}
	
	ss += '\0';
	ll = ss.length();

	i = 0;
	j = 0;


	while (-1) {
		if (ss[i] == 'c') {
			n = 0;
			for (j = i; j < ll; j++) {
				if (ss[j] == 'w') {
					n++;
				}
			}
			a = a + n*(n - 1) / 2;
		}
		else if (ss[i] == '\0') {
			break;
		}
		i++;
	}

	cout << a << endl;

	return 0;
}