using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var x = new System.Globalization.RegionInfo("en-us");

        Console.WriteLine(x.TwoLetterISORegionName);

        Console.WriteLine(x.ThreeLetterISORegionName);

        Console.WriteLine();

        x = new System.Globalization.RegionInfo("US");

        Console.WriteLine(x.TwoLetterISORegionName);

        Console.WriteLine(x.ThreeLetterISORegionName);

    }

}