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 Ruby (judge verdict: Accepted)

a = Array.new
b = Array.new
a[0], b[0] = gets.split.map(&:to_i)
i = 0
while a[i] != 0 && b[i] != 0 do
	i += 1
	a[i], b[i] = gets.split.map(&:to_i)
end
i = 0
while a[i] != 0 && b[i] != 0 do
	for j in 1..b[i] do
		print "#"
	end
	puts
	for j in 2..a[i]-1 do
		print "#"
		for k in 2..b[i]-1 do
			print "."
		end
		print "#"
		puts
	end
	for j in 1..b[i] do
		print "#"
	end
	puts
	puts
	i += 1
end