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=[]
loop{
  x=[]
  x[0],x[1]=gets.split(" ").map{|v|v=v.to_i}
  X.push(x) if x!=[0,0]
  break if x==[0,0]
}
0.upto(X.length-1){|s|
  q=[]
  p=[]
  y=X[s]
  h=y[0]
  w=y[1]
  1.upto(w){|m|
    q.push("#")
  }
  1.upto(w-2){|n|
    p.push(".")
  }
  p.unshift("#")
  p.push("#")
  puts q.join
  1.upto(h-2){|o|
    puts p.join
  }
  puts q.join
  puts ""
}