class Program
    {
        static void Main(string[] args)
        {
            string[] dish = Console.ReadLine().Split(' ');
            int errordish = int.Parse(dish[0]) - int.Parse(dish[1]);
            if(errordish < 0)
            {
                errordish *= -1;
            }
            Console.WriteLine(errordish);
        }
    }