fun main (args : Array<String>) {
	val n = readLine()!!
	val (s, t) = readLine()!!.split(" ")
	var sList : MutableList<String> = mutableListOf()
	var tList : MutableList<String> = mutableListOf()
	var result : String = ""
	for (i in s) {
		sList.add(i.toString())
	}
	for (i in t) {
		tList.add(i.toString())
	}
	for (i in 0..(n.toInt() * 2) - 1) {
		if ((i % 2) == 0) {
			result += sList[0]
			sList.removeAt(0)
		} else {
			result += tList[0]
			tList.removeAt(0)
		}
	}
	println("${result}")
}