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)

a = []
while true
  num = gets.split(" ").map(&:to_i)
  break if(num[0] == 0 && num[1] == 0)
  a.push(num)
end

a.each do |i|
  height = i[0]
  width = i[1]
  height.downto(1) do |h|
    case h
    when height, 1 then
      width.downto(1) do |w|
        printf "#" unless w == 1
        printf "#\n" if w == 1
      end
    else
      width.downto(1) do |w|
        printf "#" if w == width
        printf "#\n" if w == 1
        printf "." unless w == 1 || w == width
      end
    end
  end
  printf "\n"
end