using System;
using System.Collections.Generic;
using System.Linq;

namespace Test
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = Console.ReadLine();
            int i;
            for (i = 0; s[i] == 'c'; i++) ;
            Console.WriteLine(Math.Min(i - 1,s.Length - i));
        }
    }
}