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
  $stdin = fopen('php://stdin', "r");

  while(true) {
      fscanf($stdin, "%d %d", $inH, $inW);
      if($inH === 0 && $inW === 0) {
          break;
      }

      for ($i=0; $i<$inH; $i++) {
        echo '#';
        for ($j=1; $j<$inW-1; $j++ ) {
          if ($i == 0 || $i == $inH-1) {
            echo '#';
          } else {
            echo '.';
          }
        }
        echo '#'.PHP_EOL;
      }
      echo PHP_EOL;
  }