#include <iostream>
#include <string>
using namespace std;
int main() {
	int w_cnt=0, temp;
	long long int sum;
	string str;
	
	cin >> str;
	for(int i=0;i<str.length();++i)if(str[i]=='w')++w_cnt;
	
	temp = sum = 0;
	for(int i=0;i<str.length();++i){
		if(str[i] == 'w'){
			++temp;
		}else if(str[i] == 'c'){
			w_cnt -= temp;
			sum += w_cnt * (w_cnt - 1) / 2;
			temp = 0;
		}
	}
	cout << sum << endl;
	
	return 0;
}