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
  s=STDIN.gets
  h=s.split[0].to_i
  w=s.split[1].to_i
  break if (h==0 && w==0)

  w.times { printf("#") }
  puts "\n" 

  h-=2
  h.times {
    printf("#")
    (w-2).times {
      printf(".") }
    printf("#\n") }

  w.times { printf("#") }
  puts "\n" 

  puts "\n"
end