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

class Magatro
{
    static void Main()
    {
        string S = Console.ReadLine();
        List<int> cnt = new List<int>();
        for (int i = 0; i < S.Length; i++)
        {
            if (S[i] == 'c') cnt.Add(0);
            else if (S[i] == 'w') cnt = cnt.Select(s => s+=1).ToList();
        }
        long ans = cnt.Select(s => Combination(s)).Sum();
        Console.WriteLine(ans);
    }
    static long Combination(int n)
    {
        return n * (n - 1) / 2;
    }
}