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(fscanf(STDIN,"%d %d",$tate,$yoko)) {
        if ($tate == 0 && $yoko == 0) {
            exit;
        }
        
        for($i = 0; $i < $tate; $i++) {
            for($j = 0; $j < $yoko; $j++) {
                if ($j == 0 || $j == $yoko - 1 || $i == 0 || $i == $tate - 1) {
                    echo "#";
                } else {
                    echo ".";
                }
            }
            echo PHP_EOL;
        }
        echo PHP_EOL;
    }

?>