fun main(args :Array<String>) {
    val n = readInteger()
    val (s, t) = readStringList()

    for (i in 0 until n) {
        print(s[i])
        print(t[i])
    }
    println()
}

fun readInteger() = readLine()!!.toInt()
fun readStringList() = readLine()!!.split(" ")
fun readIntegerList() = readStringList().map(String::toInt)
fun readLongList() = readStringList().map(String::toLong)
