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)

input = gets.chomp.split("\s")
h, w = input[0].to_i, input[1].to_i

until (h == 0) && (w == 0)
	for i in 1..h
		if (i == 1) || (i == h)
			output = ['#'] * w
			puts output.join
		else
			output = ["#"] + ['.'] * (w - 2) + ["#"]
			puts output.join
		end
	end
	
puts ""
input = gets.chomp.split("\s")
h, w = input[0].to_i, input[1].to_i
end