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) {
    fscanf(STDIN, "%d %d", $H, $W);

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

    for ($i = 0; $i < $H; $i++) {
        for ($j = 0; $j < $W; $j++) {
            $is_around =
                ($i == 0 || $i == $H-1) || ($j == 0 || $j == $W-1);
            echo ($is_around ? '#' : '.');
        }

        echo "\n";
    }

    echo "\n";
}