import java.util.*;

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