using System;

public class Program

{

    private struct Customer

    {

        public String name;

    }

    public static void Main()

    {

        String s1 = "ϱ";

        String s2 = s1.ToUpper();

        String s3 = s2.ToLower();

        Console.WriteLine("Original: "+s1);

        Console.WriteLine("ToUpper: "+s2);

        Console.WriteLine("ToLower: "+s3);

    }

}