Problem:
Print a Frame

Draw a frame which has a height of H cm and a width of W cm. For example, the following figure shows a frame which has a height of 6 cm and a width of 10 cm.

##########
#........#
#........#
#........#
#........#
##########

Input

The input consists of multiple datasets. Each dataset consists of two integers H and W separated by a single space.

The input ends with two 0 (when both H and W are zero).

Output

For each dataset, print the frame made of '#' and '.'.

Print a blank line after each dataset.

Constraints

3 ≤ H ≤ 300

3 ≤ W ≤ 300

Sample Input

3 4
5 6
3 3
0 0

Sample Output

####
#..#
####

######
#....#
#....#
#....#
######

###
#.#
###

Solution in Kotlin (judge verdict: Accepted)

fun main(args: Array<String>) {
    var (h, w) = readLine()!!.split(" ").map { it.toInt() }
    while(h != 0 || w != 0) {
        if (h != 0 && w != 0) {
            val wide1 = "#".times(w)
            val wide2 = "#" + ".".times(w-2) + "#"
            println(wide1)
            for (i in 0 until h-2) {
                println(wide2)
            }
            println(wide1)
        }
        println("")
        val (h2, w2) = readLine()!!.split(" ").map { it.toInt() }
        h = h2
        w = w2
    }
}

private operator fun String.times(num: Int): String {
    var s = ""
    for (i in 0 until num) s += this
    return s
}