using System.Linq;
using System;

public class Hello
{
    public static void Main()
    {
        var s = Console.ReadLine().Trim();
        var cc = s.Count(x => x == 'c');
        var sL = s.Length;
        var ww = sL - cc;
        Console.WriteLine(Math.Min(cc - 1, ww));
    }
}