import java.io.{BufferedReader, InputStreamReader}

object Main {
  def main(args: Array[String]): Unit = {
    val in = new BufferedReader(new InputStreamReader(System.in))
    val n = in.readLine().toInt
    val Array(s, t) = in.readLine().split("\\s+")

    System.out.println(
      s.toCharArray.zip(t.toCharArray).flatMap {
        case (a, b) => "" + a + b
      }
    )
  }
}
