using System;

​

public class Program

{

    public static void Main()

    {

        for (int j = 0; j < 5; j++)

        {

            for (int i = 1; i <= 10; i++)

            {

                Console.Write(i + ", ");

            }

​

            Console.WriteLine();

            for (int i = 10; i >= 1; i--)

            {

                Console.Write(i + ", ");

            }

            Console.WriteLine("\n");

        }

    }

}