import java.util.Scanner;

public class Main {

	public static void main (String[] args) {

		Scanner sc = new Scanner(System.in);

		System.out.println(solve(sc.next()));

		sc.close();

	}

	public static int solve (String s) {
		int wcnt = 0, sum = 0;
		int len = s.length();
		for (int i = len - 1; i >= 0; i--) {
			if (s.charAt(i) == 'w') {
				wcnt++;
				continue;
			}
			if (s.charAt(i) == 'c')
				sum += wcnt * (wcnt - 1) / 2;
		}
		return sum;
	}

}