#include <bits/stdc++.h>
using namespace std;

int main(){
	string s;
	cin >> s;
	long long w = 0,sum = 0;
	for(long long i = s.size() - 1; i >= 0; i--){
		if(s[i] == 'c' && w != 0){
			sum += w * (w - 1) / 2;
		}
		if(s[i] == 'w') w++;
	}
	cout << sum << endl;			
	return 0;
}