fun main(args: Array<String>) {
    val N = readInputLine().toInt()

    val (S, T) = readInputLine().split(" ").map { it.toCharArray() }

    for (i in 0 until N) {
        print(S[i])
        print(T[i])
    }
    println()
}

fun readInputLine(): String {
    return readLine()!!
}
