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
$p='';
while(1){
  list($h,$w)=explode(' ',trim(fgets(STDIN)));
  if($h||$w){

    $l='#';for($i=2;$i<$w;$i++){$l.='#';}$l.='#'.PHP_EOL;

    $m='#';for($i=2;$i<$w;$i++){$m.='.';}$m.='#'.PHP_EOL;

    $p.=$l;for($i=2;$i<$h;$i++){$p.=$m;}$p.=$l.PHP_EOL;
  }
  else break;
}
print $p;