using System;

namespace No346
{
    class Program
    {
        static void Main(string[] args)
        {
            long num = 0;
            long count = 0;
            string text = Console.ReadLine();

            for (int i = text.Length - 1; i >= 0; i--)
            {
                if (text[i] == 'w')
                    count++;

                if (text[i] == 'c')
                    num += count * (count - 1) / 2;
            }

            Console.WriteLine(num);
        }
    }
}