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 str = STDIN.gets
  n = str.split(" ")
  a = n[0].to_i
  b = n[1].to_i

  if a == 0 && b == 0
    break
  else
      for w in 1..b do
        print "#"
      end
      print "\n"
      for h in 1..a-2 do
        print "#"
        for ten in 1..w-2 do
          print "."
        end
        print "#"
         print "\n"
      end
      for w in 1..b do
        print "#"
      end
      print "\n"
  end
  print "\n"
end