using System;
using System.Collections.Generic;

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

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

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

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

            Console.WriteLine(num);
        }
    }
}