#include <bits/stdc++.h>
#define rep(i,n) for(int i=(0);i<(n);i++)

using namespace std;

typedef long long ll;
typedef unsigned long long ull;

template<class T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; }

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);

	string s;
	cin >> s;

	ll n = s.size();

	ll ccnt = 0;
	ll cwcnt = 0;

	ll ans = 0;
	rep(i, n){
		if(s[i] == 'c') ccnt++;
		if(s[i] == 'w'){
			ans += cwcnt;
			cwcnt += ccnt;
		}
	}

	cout << ans << endl;
}