fun main(args: Array<String>) {
    val n = readLine()!!.toInt()
    val (s,t) = readLine()!!.split(" ")

    val sb = StringBuilder(2*n)
    val sit = s.iterator()
    val tit = t.iterator()

    while(sit.hasNext() && tit.hasNext()){
        sb.append(sit.nextChar())
        sb.append(tit.nextChar())
    }

    println(sb.toString())

}

