using System;

public class Program

{

    public static void Main()

    {

        string s1 = "Иван", s2 = "Борис";

        string s3 = s1 + s2;

        string s4 = s2 + s1;

        Console.WriteLine(s3+" "+s4);

        Console.WriteLine(s4+" "+s3);

    }

}