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)
{
    $in = explode(" ", trim(fgets(STDIN)));
    $h = $in[0];
    $w = $in[1];
    if($h == 0 && $w == 0)
    {
        break;
    }
    for($i = 0; $i < $h; $i++)
    {
        if($i == 0 || $i == ($h - 1))
        {
            for($j = 0; $j < $w; $j++)
            {
                echo "#";
            }
        }
        else
        {
            for($j = 0; $j < $w; $j++)
            {
                if($j == 0 || $j == ($w - 1))
                {
                    echo "#";
                }
                else
                {
                    echo ".";
                }
            }
        }
        echo "\n";
    }
    echo "\n";
}