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)

x = gets()
y = x.split()
h = y[0].to_i
w = y[1].to_i

until h == 0 && w == 0
 i = 1
 while i <= h
  if i == 1 || i == h
  puts "#" * w
  i += 1
  else
  puts "#" + "." * (w - 2) + "#"
  i += 1
  end

 end
 puts ""
 x = gets()
 y = x.split()
 h = y[0].to_i
 w = y[1].to_i
end