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

int main(void){
	string S;
	cin >> S;
	long long  ans = 0;
	long long   w = 0;
	for(int i = S.length()-1 ;i >= 0;i--){
		if(S[i] == 'w') w++;
                if(S[i] == 'c') ans += w * (w-1) / 2;
    	}
    	cout << ans << endl;
    	return 0;	
    }