using System;

public class Hello
{
    public static void Main()
    {
        var s = Console.ReadLine().Trim();
        var sL = s.Length;
        var ccount = sL - s.Replace("c", "").Length;
        var wcount = sL - ccount;
        Console.WriteLine(ccount <= wcount ? ccount - 1 : wcount);
    }
}