class Program
    {
        static void Main(string[] args)
        {
            string str = Console.ReadLine();
            int[] countList = { 0, 0 };
            foreach(char c in str)
            {
                if(c == 'c')
                {
                    countList[0]++;
                }
                else
                {
                    countList[1]++;
                }
            }
            int ans = 0;
            if(countList[0] <= countList[1])
            {
                ans = countList[0] -1;
            }
            else
            {
                ans = countList[1];
            }
            Console.WriteLine(ans);
            
        }  
    }