using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace yukicoderTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] input = Console.ReadLine().Split(' ');
            long a = long.Parse(input[0]);
            long c = long.Parse(input[1]);
            long ans = a-c;
            if (ans < 0)
            {
                Console.WriteLine(ans * -1);
            }
            //else
            //{
            //    Console.WriteLine(ans);
            //}
        }
    }
}