using System;

public class Program

{

    public static void Main()

    {

        string sNameSurname = "Mary Isobel Catherine O’Brien";

        Console.WriteLine(sNameSurname);

        Console.WriteLine("\n-------------------------");

        string[] sArr = SplitFullNameIntoNameAndSurname(sNameSurname);

        Console.WriteLine("Name : " + sArr[0] + " , Surname : " + sArr[1]);

    }

    public static string[] SplitFullNameIntoNameAndSurname(string pFullName)

    {

        string[] NameSurname = new string[2];

        string[] NameSurnameTemp = pFullName.Split(' ');

        for (int i = 0; i < NameSurnameTemp.Length; i++)

        {

            if (i < NameSurnameTemp.Length - 1)

            {

                if (!string.IsNullOrEmpty(NameSurname[0]))

                    NameSurname[0] += " " + NameSurnameTemp[i];

                else

                    NameSurname[0] += NameSurnameTemp[i];

            }

            else

                NameSurname[1] = NameSurnameTemp[i];

        }

        return NameSurname;

    }

}