object Main extends App {
	val N = scala.io.StdIn.readInt
	val Array(s1, t1) = scala.io.StdIn.readLine.split(" ").map(_.toList)

	var ans: String = ""

	for(i<-0 until N){
		ans = ans + s1(i) + t1(i)
	}

	println(ans)

}