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)

def rec(h,w)
  h.times do |x|
    w.times do |y|
      if x == 0 || x == h - 1 || y == 0 || y == w - 1
        print "#"
      else
        print "."
      end
    end
    print "\n"
  end
end

while true
  h, w = gets.chomp.split.map(&:to_i)
  break if w == 0 && h == 0
  rec(h, w)
  puts ""
end