#include<iostream>
#include<string>
using namespace std;

int main()
{
	string s;

	cin >> s;

	int count = 0, ans = 0;
	for (int i = s.size(); i >= 0; i--)
	{
		if (s[i] == 'w')
		{
			count++;
		}

		if (s[i] == 'c')
		{
			ans += count * (count - 1) / 2;
		}
	}
	cout << ans << endl;
}