import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        sc.close();
        int length = S.length();
        long cum[] = new long[length], ans = 0;
        if (S.charAt(length - 1) == 'w') cum[length - 1] = 1;
        else cum[length - 1] = 0;
        for (int i = length - 2; 0 <= i; --i) {
            if (S.charAt(i) == 'w') cum[i] = cum[i + 1] + 1;
            else cum[i] = cum[i + 1];
        }
        for (int i = 0; i < length; ++i) {
            if (S.charAt(i) == 'c') ans += ((cum[i] - 1) * cum[i]) / 2;
        }
        System.out.print(ans);
    }
}