using System;

public class Program

{

    public static void Main()

    {

        var fullName = "John Doe Jackson";

        var lastSpaceIndex = fullName.LastIndexOf(' ');

        var firstName = fullName.Substring(0, lastSpaceIndex);

        var lastName = fullName.Substring(lastSpaceIndex+1);

        Console.WriteLine(firstName);

        Console.WriteLine(lastName);

    }

}