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) = array_map("intval", explode(' ', trim(fgets(STDIN))));

    if ($H == 0 && $W == 0) break;

    $line1 = str_repeat('#', $W) . "\n";
    $line2 = '#' . str_repeat('.', $W - 2) . '#' . "\n";
    $rectangle = $line1 . str_repeat($line2, $H - 2) . $line1;

    echo $rectangle . "\n";
}