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)

loop do
  a = gets.split(" ").map{|x| x.to_i}
  h = a[0]
  w = a[1]
  break if h + w == 0
  for i in 1..h do
    for j in 1..w do
      if i == 1 || i == h
        printf "#"
      elsif j ==1 || j == w
        printf "#"
      else
        printf "."
      end
    end
    puts
  end
  puts
end