#include <iostream>
#include <cmath>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <list>
#include <deque>
#include <algorithm>
#include <iomanip>
#include <functional>
#include <numeric>
#include <sstream>

#define REP(i, n) for(int i = 0;i < (n); i++)
#define REP2(i, x, n) for(int i = (x); i < (n); i++)
#define RREP(i, n) for (int i = (n) -1;i >=0 ; i--)

#define ALL(a) (a).begin(),(a).end()
#define SORT(c) sort((c).begin(),(c).end())
#define DESCSORT(c) sort(c.begin(), c.end(), greater<int>())

#define LL long long int
#define LD long double

#define PI 3.14159265358979

using namespace std;

//================================================

int main() {
	string S;
	cin >> S;

	LL ans = 0;
	LL w = 0;
	RREP(i, S.length()) {
		if (S[i] == 'w') {
			w++;
		}
		if (S[i] == 'c') {
			ans += w * (w - 1) / 2;
		}
	}
	cout << ans << "\n";
	return 0;
}