import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        try (Scanner scan = new Scanner(System.in)) {
            String S = scan.nextLine();
            int count = 0;
            int ans = 0;
            for(int i=S.length()-1; i>=0; i--) {
                if(S.charAt(i) == 'w') {
                    count++;
                } else if(S.charAt(i) == 'c') {
                    ans += count * (count-1) / 2;
                }
            }
            System.out.println(ans);
        }
    }
}