import java.lang.Math

val MOD: Int = 1000000000 + 7
val MODL: Long = MOD.toLong()

fun main(args: Array<String>)
{
    val n = read().toInt()
    val (s, t) = read().split(" ").map{it.toCharArray()}

    var ans: String = ""
    for (i in 0 until n) {
        ans += s[i]
        ans += t[i]
    }

    println(ans)
}

fun read(): String = readLine()!!
