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)

inputs = []

while true
  h, w = $stdin.readline.split(" ").map {|s| s.to_i }

  if h == 0 && w == 0
    break
  end

  inputs.push([h, w])
end

inputs.each do |h, w|
  (1..h).each_with_index do |y, i|
    if i == 0 || i == h - 1
      puts "#" * w
    else
      print "#", "." * (w - 2), "#", "\n"
    end
  end

  puts
end