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

long long combi(long long w){
	return (w * (w-1))/2;
}

int main(void){
	string s;
	cin >> s;
	long long c = 0;
	long long ret = 0;
	vector<long long> w(s.size());
	for(int i=0;i<s.size();i++)
		if(s[i] == 'w')w[i] = 1;
	for(int i=s.size()-1;i>0;i--)
		w[i-1] += w[i];
	
	for(int i=0;i<s.size();i++){
		if( s[i] == 'c' ){
			// cout << i << " " << w[i] << endl;
			ret += combi(w[i]);
		}
	}
	cout << ret << endl;
	return 0;
}