fun main(args:Array<String>){
    val n = readLine()!!.toInt()
    val list = readLine()!!.split(" ").toMutableList()
    val s = list[0].split("")
    val t = list[1].split("")
    var str = ""
    for(i in 0 .. n) {
        str += s[i] + t[i]
    }
    println(str)
}