fun main(args: Array<String>) {
    val n = readLine()!!.toInt()
    val st = readLine()!!.split(" ")
    val s = st[0].toCharArray()
    val t = st[1].toCharArray()
    var result = ""
    for ( i in 0 until s.count() ) {
        result += s[i].toString() + t[i].toString()
    }
    print(result)
}