#include <iostream>
#include <vector>
using namespace std;


int nC2(int a){
	if( a < 2) return 0;
	return a * (a-1) / 2 ;
}

int main() {
	// your code goes here
	vector<char> vec;
	int ans = 0;
	
	for(char ch; cin >> ch;) if((ch == 'c' || ch == 'w'))	vec.push_back(ch);
	
	for(int i = 0; i<vec.size();i++){
		if(vec[i] == 'c'){
			int temp = 0;
		for(int j = i+1; j < vec.size();j++) if(vec[j] == 'w') temp++;
		ans += nC2(temp);
		}
	}
	
	cout << ans << endl;
	
	return 0;
}