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 1 do
h,w=gets.split(" ");
h=h.to_i;
w=w.to_i;

if h==0 && w==0 then
        break
end

(1..w).each{|i|
        print "#"
}
print "\n"

(2..h-1).each{|i|
        print "#"
        (2..w-1).each{|j|
                print "."
        }
        print "#\n"
}
(1..w).each{|i|
        print "#"
}
print "\n";
print "\n";
end