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)

ARGF.each_line do |line|
  h, w = line.split.map(&:to_i)
  i = 0
 while (h >= 3 && w <= 300) do
  i += 1
  break if [h, w].eql? [0, 0]
    case i
    when 1, h
      puts '#' * w
    when h + 1
      puts
      break
    else
      print "#", ("." * (w - 2)), "#\n"
    end
  end
end