using System;

namespace _13._Prime_Pairs
{
    internal class Program
    {
        static void Main(string[] args)
        {
            int firstStartCombination = int.Parse(Console.ReadLine());
            int SecondStartCombination = int.Parse(Console.ReadLine());
            int endFirstLoop = int.Parse(Console.ReadLine());
            int endSecondLoop = int.Parse(Console.ReadLine());
            bool firstLoop = true, secondLoop = true;
            int endFLoop = firstStartCombination + endFirstLoop;
            int endSLoop = SecondStartCombination + endSecondLoop;

            for (int i = firstStartCombination; i <= endFLoop; i++)
            {
                for (int o = SecondStartCombination; o <= endSLoop; o++)
                {
                    for (int n = 2; n <= Math.Sqrt(i); n++)
                    {
                        if (i % n == 0) { firstLoop = false; break; }

                    }


                    for (int m = 2; m <= Math.Sqrt(o); m++)
                    {
                        if (o % m == 0) { secondLoop = false; break; }

                    }

                    if (firstLoop && secondLoop)
                    {
                        Console.WriteLine($"{i}{o}");
                    }
                    else { firstLoop = true; secondLoop = true; }

                }

            }
        }
    }
}