fun main (args:Array<String>){
    var strLen = readLine()!!.toInt()
    val(strS, strT) = readLine()!!.split(" ")
    var strNew = ""

    for (i in 0..strLen-1){
        strNew += strS.elementAt(i)
        strNew += strT.elementAt(i)
    }
    println(strNew)
}