using System;
using System.Collections.Generic;
using System.Linq;

namespace yukicoder
{
	public class Program
	{
		public static void Main()
		{
			var c = Console.ReadLine();
			long sum = 0;
			long w = 0;
			for (var i = c.Length - 1; i >= 0; i--)
			{
                if (c[i] == 'w')
				{
					w++;
				}
				else if (c[i] == 'c')
                {
					sum += w * (w - 1) / 2;
				}
			}
			Console.WriteLine(sum);
		}
	}
}