object Main extends App {
    val n = io.StdIn.readLine().toInt
    val st = io.StdIn.readLine().split(' ')
    val s = st(0)
    val t = st(1)

    var ans: String = ""
    for(i <- 0 until n){
        ans += s(i)
        ans += t(i)
    }
    println(ans)
}