using System;

namespace Car_Number
{
    class Program
    {
        static void Main(string[] args)
        {
            int startNumber = int.Parse(Console.ReadLine());
            int endNumber = int.Parse(Console.ReadLine());

            for (int n1 = startNumber; n1 <= endNumber; n1++)
            {
                for (int n2 = startNumber; n2 <= endNumber; n2++)
                {
                    for (int n3 = startNumber; n3 <= endNumber; n3++)
                    {
                        for (int n4 = startNumber; n4 <= endNumber; n4++)
                        {
                            Console.WriteLine($"{n1}");
                        }
                    }
                }
            }
        }
    }
}