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
  h,w = gets.chomp.split(" ").map &:to_i
  break if w == 0 and h == 0

  f = ""
  b = ""
  w.times { |i|
   f << "#"
   if i == 0 or i == w-1
     b << "#"
   else
     b << "."
   end
  }

  h.times { |i|
    if i == 0 or i == h-1
      puts f
    else
      puts b
    end
  }

  puts
end