#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int i=a;i<b;i++)
#define INF INT_MAX/2
#define rrep(i,a,b) for(int i=a;i>=b;i--)

typedef vector<int> vi;

int main()
{
	string S; cin >> S;
	
	vi w(S.length() + 1, 0);
	rep(i, 0, S.length()) if (S[i] == 'w') w[i + 1] = 1;
	rrep(i, S.length() - 1, 0) w[i] += w[i + 1];

	int ans = 0;
	rep(i, 0, S.length()) if (S[i] == 'c')
	{
		ans += w[i + 1] * (w[i + 1] - 1) / 2;
	}
	cout << ans << endl;
}