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)

import java.util.*

fun main(args: Array<String>) {
	val cin = Scanner(System.`in`)
	val ans = mutableListOf<String>()

	while (true) {
		val H = cin.nextInt()
		val W = cin.nextInt()
		if (H + W == 0) break

		for (h in 0 until H) {
			if (h !in 1 until H - 1) {
				ans.add("#".repeat(W))
			} else {
				ans.add('#' + ".".repeat(W - 2) + '#')
			}
		}
		ans.add("")
	}
	println(ans.joinToString("\n"))
}