import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String s = in.next();

        int l = s.length();
        int ans = 0;
        int wc = 0;

        for(int i=l-1; i>=0; i--) {
            if(s.charAt(i) == 'w') wc++;
            if(s.charAt(i) == 'c') ans += wc * (wc-1) / 2;
        }

        System.out.println(ans);
    }
}