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)

$<.each_line do |line|
	h, w = line.split.map(&:to_i)
	break if h.zero? && w.zero?

	puts '#' * w
	if 2 <= h
		(h - 2).times do
			print '#'
			if 2 <= w
				print '.' * (w - 2)
				print '#'
			end
			puts
		end
		puts '#' * w
	end

	puts
end