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();
        long ans = 0;
        long cnt=0;
        for(int i = S.Length - 1; i >= 0; i--)
        {
            if (S[i] == 'w') cnt++;
            else if (S[i] == 'c') ans += Combination(cnt);
        }
        Console.WriteLine(ans);
    }
    static long Combination(long n)
    {
        return n * (n - 1) / 2;
    }
}