import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String S = scan.next();
		scan.close();
		int l = S.length();
		int[]k = new int[l];
		int cnt = 0;
		for(int i = 0; i < l; i++) {
			if(S.charAt(i) == 'w'){
				cnt++;
			}
			k[i] = cnt;
		}
		long ans = 0;
		for(int i = 0; i < l; i++) {
			if(S.charAt(i) == 'c') {
				int m = cnt - k[i];
				if(m >= 2) {
					ans += (long)m * (m - 1) / 2;
				}else {
					break;
				}
			}
		}
		System.out.println(ans);
	}
}