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 PHP (judge verdict: Accepted)

<?php
    while(true){
        list($height, $width) = explode(" ",trim(fgets(STDIN)));

        if($height == 0 && $width == 0) exit;
    
        $bar1 = str_repeat("#",$width)."\n";
        $bar2 = "#".str_repeat(".",$width-2)."#\n";

        print $bar1;
        for($j = 0; $j < $height - 2 ; $j++){
            print $bar2;
        }
        print $bar1."\n";
    }