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 str = STDIN.gets
  if str.chomp == "0 0" then break end
  inputs << str.chomp
end

def describe_rectangle(h, w)
  # puts "h = #{h}, w = #{w}"
  output = ""
  for j in 1..h do
    for i in 1..w do
      if i == 1 || i == w then
        output += "#"
      elsif j == 1 || j == h then
        output += "#"
      else
        output += "."
      end
    end
    output += "\n"
  end
  puts output
end

# puts inputs
for num in 0..inputs.length - 1 do
  rec = inputs[num].split(" ")
  # puts "rec = #{rec}"
  describe_rectangle(rec[0].to_i, rec[1].to_i)
  puts "\n"
end