#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ul = unsigned long;
using ull = unsigned long long;

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	string s;
	cin >> s;

	ll w{ 0 }, res{ 0 };
	for (string::const_reverse_iterator it=s.crbegin();
		it!=s.crend();
		++it)
	{
		if (*it == 'w')
			++w;
		else if (*it == 'c' && w > 1)
			res += w * (w - 1) / 2;
	}

	cout << res << "\n";

	return 0;
}