class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            string[] setA = Console.ReadLine().Split(' ');
            string[] setB = Console.ReadLine().Split(' ');
            int lose = -1;
            for(int i = 0; i < n-1; i++)
            {
                if(setA[i] != setB[i])
                {
                    lose = i;
                    break;
                }
            }
            if(lose == -1)
            {
                lose = n - 1;
            }
            Console.WriteLine(setA[lose]);
        }
    }