fun main(){
    val n = readLine()!!.toInt()
    val (s,t) = readLine()!!.split(" ")
    var ans = ""
    for(i in 0 until n){
        val sub1 = s.substring(i,i+1)
        val sub2 = t.substring(i,i+1)
        ans += sub1+sub2
    }
    println(ans)
}