class Program
    {
        //GetLength(1)-столбцы

        static void Main(string[] args)
        {
            int a = int.Parse(Console.ReadLine());
            int b = int.Parse(Console.ReadLine());
            List<int> numbers = new List<int>();

            for (int i=a;i<=b;i++)
            {
                numbers.Add(int.Parse(Console.ReadLine()));
            }
            
            IEnumerable<int> distinctNumbers = numbers.AsQueryable().Distinct();

            Console.WriteLine("Distinct numbers:");

            foreach (int num in distinctNumbers)
                Console.Write(num);

            Console.WriteLine();
          }
     }