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)

nyu = true

while nyu == true do
  x, y= gets.chomp.split(" ").map(&:to_i)
  if x == 0 && y == 0
    nyu = false
  else
    y.times do
      print "#"
    end
    puts ""

    (x - 2).times do
      print "#"
      (y - 2).times do
        print "."
      end
      print "#"
      puts ""
    end

    y.times do
      print "#"
    end
    puts ""
    puts ""
  end
end