using System;
using System.Linq;

namespace ConsoleApplication6
{
    class Program
    {
        static void Main(string[] args)
        {
            var s = Console.ReadLine();
            var w = s.Count(x => x == 'w');
            var answer = s.Aggregate(0L, (sum, x) =>
                {
                    if (x == 'w') { w--; }
                    if (x == 'c')
                    {
                        sum += w * (w - 1) / 2;
                    }
                    return sum;
                });
            Console.WriteLine(answer);
        }
    }

}