#include<iostream>
#include<string>

using namespace std;

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

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

	for (i = 0; i < l; i++) {
		if (s[i] == 'c') {
			ss += 'c';
			nc += 1;
		}
		else if (s[i] == 'w') {
			ss += 'w';
			nw += 1;
		}
	}
	
	ss += '\0';
	ll = ss.length();

	i = 0;
	j = 0;


	for (i = 0; i < ll; i++) {
		if (ss[i] == 'c') {
			j++;
			n = nw - (i + 1) + j;
			a = a + n*(n - 1) / 2;
			//cout << a << endl;
		}
	}


	/*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;
}