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>) {

    val pairList = arrayListOf<Pair<Int, Int>>()

    while (true) {

        val input = readLine()?.split(" ") ?: return
        val list = arrayListOf<Int>()
        input.forEach { list.add(it.toInt()) }

        if (list[0] == 0 && list[1] == 0) break
        pairList.add(Pair(list[0], list[1]))
    }

    for (pair in pairList) {
        for (h in 0 until pair.first) {
            for (w in 0 until pair.second) {
                if (h != 0 && h != pair.first - 1 &&
                    w != 0 && w != pair.second - 1) print(".")
                else print("#")
            }
            println()
        }
        println()
    }
}