using System;

public class hello
{
    static void Main()
    {
        var s = Console.ReadLine().Trim();
        var sL = s.Length;
        var wc = new long[sL];
        var ans = 0L;
        if (s[sL - 1] == 'w') wc[sL - 1] = 1;
        if (sL > 2)
        {
            for (int i = sL - 2; i >= 0; i--)
            {
                wc[i] = wc[i + 1];
                if (s[i] == 'w') wc[i]++;
                else if (s[i] == 'c') ans += wc[i] * (wc[i] - 1) / 2;
            }
        }
        Console.WriteLine(ans);
    }
}