import java.lang.StringBuilder
import java.util.*

fun main(args: Array<String>){
    val sc:Scanner = Scanner(System.`in`)

    val length = sc.nextInt()
    val S: String = sc.next()
    val T: String = sc.next()

    val sb = StringBuilder()

    for(i in 0..length-1){
        val s = S.substring(i,i+1)
        val t = T.substring(i,i+1)
        sb.append(s)
        sb.append(t)
    }

    println(sb.toString())

    sc.close()
}