using System;

namespace No346
{
    class Program
    {
        static void Main(string[] args)
        {
            int count_c = 0;
            int[] count_w = new int[100000];
            int num = 0;
            int count= 0;
            string text = Console.ReadLine();

            for (int i = 0; i < text.Length; i++)
            {
                if (text[i] == 'c')
                    count_c++;

                if (text[i] == 'w')
                    count_w[count_c]++;
            }

            for (int i = count_c; i > 0; i--)
            {
                count += count_w[i];
                if (count > 1)
                {
                    num += Factorial(count) / (2 * Factorial(count - 2));
                }
            }

            Console.WriteLine(num);
        }

        static int Factorial(int num)
        {
            int result = 1;

            for (int i = 1; i <= num; i++)
                result *= i;

            return result;
        }
    }
}