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)

while true do
  num=Array.new
  str=gets.chomp
  number=str.split
  num[0]=number[0].to_i
  num[1]=number[1].to_i
  if num[0]==0 && num[1]==0 then
    break
  end
  for i in 1..num[0] do
    for j in 1..num[1] do
      if i==1 || i==num[0] || j==1 || j==num[1] then
        print "#"
      else
        print "."
      end
    end
    print "\n"
  end
  print "\n"
end