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)

while true
    rect = gets.split.map(&:to_i)
    break if (rect[0] == 0 && rect[1] == 0)
    cen = rect[0]-2
    cen2 = rect[1]-2
    
    puts '#'*rect[1]
    
    cen.times do
        print "#"
        print '.'*cen2
        print "#"
        puts
    end
    
    puts '#'*rect[1]
    
    puts
    
end