using System;

​

namespace pick_thing

{

    enum Element

    {

        Fire, Water, Air, Earth

    }

    class Program

    {

        static void Main(string[] args)

        {

            var pick = ElementPick("What's your element");

            Console.WriteLine(pick);

        }

        static Element ElementParse(string str)

        {

            str = str.Trim().ToLower();

            if (str == "fire") return Element.Fire;

            if (str == "water") return Element.Water;

            if (str == "air") return Element.Air;

            if (str == "earth") return Element.Earth;

​

            throw new Exception();

        }

        static Element ElementPick(string question)

        {

            while (true)

            {

                Console.WriteLine(question);

                try

                {

                    var answer = Console.ReadLine();

                    var pick = ElementParse(answer);

                    return pick;

                }

                catch

                {

                    Console.WriteLine("I N V A L I D  A N S W E R !");

                }

​

            }

        }

    }

}

​