Imports System

Public Class Program

    Public Shared Sub Main(args As String())

        Dim N As Integer = Integer.Parse(Console.ReadLine)

        Dim ST() As String = Console.ReadLine.Split(" ")

        Dim answer As String = ""

        For i As Integer = 0 To N - 1
            answer = answer & ST(0)(i)
            answer = answer & ST(1)(i)
        Next

        Console.WriteLine(answer)

    End Sub


End Class
