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)

lines = []

while line = gets
  lines << line.chomp.split(' ').map(&:to_i)
end

lines.each do |line|
  next if line[0] == 0 || line[1] == 0
  h_count = 1
  height = line[0].to_i
  line[0].times do
    w_count = 1
    width = line[1].to_i
    hash = []
    line[1].times do
      if h_count == 1 || h_count == height
        hash << "#"
      else
        if w_count == 1 || w_count == width
          hash << "#"
        else
          hash << "."
        end
        w_count += 1
      end
    end
    puts hash.join('')
    h_count += 1
  end
  puts "\n"
end