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: WA: Presentation Error)

<?php
// H W
while(true){
    //STDIN
    fscanf(STDIN, "%d %d", $h, $w);

    //break
    if($h == 0 && $w == 0){
        break;
    }
    
    for($i = 1; $i <= $h; $i++){
        if($i == 1 || $i == $h){
            //top & bottom
            echo str_repeat("#", $w).PHP_EOL;
        }else{
            //middle
            echo "#". str_repeat(".", $w-2). "#".PHP_EOL;
        }
    }
    echo PHP_EOL;
}
?>