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(&:to_i)
  ans = ""
  break if a[0] == 0 && a[1] == 0
  for i in 0...a[1] do
    ans << "#"
  end
  puts ans
  ans = ""
  ans << "#"
  for i in 2...a[1] do
    ans << "."
  end
  ans << "#"
  for j in 2...a[0] do
    puts ans
  end
  ans = ""
  for i in 0...a[1] do
    ans << "#"
  end
  puts ans
  puts ""
end