import java.util.Scanner;


public class Main_yukicoder346 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        char[] s = sc.next().toCharArray();
        int n = s.length;

        int[] cnt = new int[n + 1];
        for (int i = n - 1; i >= 0; i--) {
    		cnt[i] = cnt[i + 1];
        	if (s[i] == 'w') {
        		cnt[i]++;
        	}
        }

        long ret = 0;
        for (int i = 0; i < n; i++) {
        	if (s[i] == 'c' && cnt[i + 1] >= 2) {
        		ret += (long)cnt[i + 1] * (cnt[i + 1] - 1) / 2;
        	}
        }

        System.out.println(ret);

        sc.close();
    }
}