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


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

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