import java.util.Scanner

object Main extends App {
  val sc = new Scanner(System.in)

  val n = sc.nextInt
  val s = sc.next
  val t = sc.next

  val res = (s zip t).foldLeft(""){ case (str, (sCh, tCh)) =>
      str + sCh + tCh
  }

  println(res)

}