#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 REPR(i, n) for(int i = (n); 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() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	
	string S;
	cin >> S;

	int ans = 0, Ssize = S.size(), wCount = 0;
	REPR(i, Ssize) {
		switch (S[i]) {
			case 'w' :
				wCount++;
				break;
			case 'c' :
				ans +=  wCount * (wCount - 1) / 2;
				break;
			default:
				break;
		}
	}
	cout << ans << "\n";
	return 0;
}