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($h, $w) = sscanf(trim(fgets(STDIN)), "%d %d");
    if ($h == 0 && $w == 0) { break; }
    
    for ($i=1; $i<=$h; $i++) {
        
        for ($j=1; $j<=$w; $j++) {
            if ($i==1 || $i==$h) {
                echo "#";
            } else {
                if ($j==1 || $j==$w) {
                    echo "#";
                } else {
                    echo ".";
                }
            }
            
        }
        echo "\n";
    }
    echo "\n";
}