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

class Program
{
    public void Proc()
    {
        Reader.IsDebug = false;
        string inpt = Reader.ReadLine();
        long[] cnt = new long[inpt.Length];
        int total = 0;
        for(int i=inpt.Length-1; i>=0; i--) {
            if(inpt[i] == 'w') {
                total++;
            }
            cnt[i] = total;
        }
        
        long ans = 0;
        for(int i=0; i<inpt.Length; i++) {
            if(inpt[i] == 'c') {
                if(cnt[i] >= 2) {
                    ans += (cnt[i] * (cnt[i] - 1)) / 2;
                } else
                {
                    break;
                }
            }
        }
        Console.WriteLine(ans);




    }
    


    public class Reader
    {
        public static bool IsDebug = true;
        private static String PlainInput = @"



cwcwcwwwcccccccccccwwwww




";
        private static System.IO.StringReader Sr = null;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (Sr == null)
                {
                    Sr = new System.IO.StringReader(PlainInput.Trim());
                }
                return Sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
    }
    static void Main()
    {
        Program prg = new Program();
        prg.Proc();
    }
}