using System;

​

    public class Program

    {

        public static void Main(string[] args)

        {

            int i,j; 

            string s,k;

            for( i=0; i<=15; i++)

            {

                for( j=0; j<=15; j++)

                {

                    s=Convert.ToString(i);

                    k=Convert.ToString(j);

                    switch (s)

                    {

                        case "10":

                            s = "A";

                            break;

                        case "11":

                            s = "B";

                            break;

                        case "12":

                            s = "C";

                            break;

                        case "13":

                            s = "D";

                            break;

                        case "14":

                            s = "E";

                            break;

                        case "15":

                            s = "F";

                            break;

                    }

                    switch (k)

                    {

                        case "10":

                            k = "A";

                            break;

                        case "11":

                            k = "B";

                            break;

                        case "12":

                            k = "C";

                            break;

                        case "13":

                            k = "D";

                            break;

                        case "14":

                            k = "E";

                            break;

                        case "15":

                            k = "F";

                            break;

                    }

                    Console.Write("{0}{1} ",s,k);

                }

                Console.WriteLine();

            }

​

            Console.ReadLine();

        }

    }