import java.util.Scanner;

public class Main {

	@SuppressWarnings("resource")
	public static void main(String args[]) {
		Scanner scanner = new Scanner(System.in);
		String s=scanner.next();
		int cnt=0;
		int ans=0;
		for(int i=s.length()-1;i>=0;i--) {
			char c=s.charAt(i);
			if(c=='w') {
				cnt++;
			}else if(c=='c'){
				ans+=calc(cnt-1);
			}
		}
		System.out.println(ans);
	}

	private static int calc(int cnt) {
		int res=0;
		for(int i=cnt;i>0;i--) {
			res+=i;
		}
		return res;
	}
}