#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream> 
#include<map>
#include <list>
#include <typeinfo>
using namespace std;
#define REP(a,b) for(long long a = 0;a < b;++a)
int main() {
	string joke;
	cin >> joke;
	string s;
	for (int i = joke.length()-1;i >= 0;--i) {
		s.push_back(joke[i]);
	}
	long long ans = 0;
	int counter_w = 0;
	for (int i = 0;i < s.length();++i) {
		if (s[i] == 'w') {
			counter_w++;
		}
		else if (s[i] == 'c') {
			if (counter_w >= 2) ans += counter_w*(counter_w - 1) / 2;
		}
	}
	cout << ans << endl;
}