using System;
namespace Yuki
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = Console.ReadLine();
            int w = 0;
            int wc = 0;
            int a = 0;
            for (int i = s.Length - 1; i >= 0; i--)
            {
                if (s[i] == 'w')
                {
                    w++;
                    wc += w - 1;
                }
                else if (s[i] == 'c')
                {
                    a += wc;
                }
            }
            Console.WriteLine(a);
        }
    }
}