import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		String s = sc.next();
		long w = 0;
		long num = 0;
		for (int i=s.length()-1; i>=0; i--) {
			if (s.charAt(i)=='w') {w++;}
			if (s.charAt(i)=='c') {
				num += w*(w-1)/2;
			}
		}
		System.out.println(num);
	}
}