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

using namespace std;

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