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>) {
    while (true) {
        val inStr = readLine()
        val (h, w) = inStr?.split(' ')?.map { s -> s.toInt() } ?: return

        if ((h == 0) && (w == 0)) {
            return
        }
        printFrame(h, w)
        println()
    }
}

fun printFrame(height:Int, width:Int) {
    val verticalEdge = "#".repeat(width)
    var bodyLine = "#" + ".".repeat(width - 2) + "#"

    println(verticalEdge)
    (1..(height - 2)).map { _ -> println(bodyLine) }
    println(verticalEdge)
}