using System;

public class Test
{
enum letters: int
        {
            a,b,c,d,e,f
        }


        static void Main(string[] args)
        {
            foreach (var s in Enum.GetValues(typeof(letters)))
            {
                Console.Write((int)s);
            }
            Console.WriteLine();
            foreach (var s in Enum.GetNames(typeof(letters)))
            {
                Console.Write(s);
            }
            Console.WriteLine();

            Console.WriteLine(Enum.GetName(typeof(letters), 5));


        }
}