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 JavaScript (judge verdict: Accepted)

const input = require('fs').readFileSync('/dev/stdin', 'utf8');

const arr = input.split(/\n/);
let stack = "";
arr.forEach(item => {
  const rectangle = item.split(" ").map(Number);
  const h = rectangle[0];
  const w = rectangle[1];
  if(h === 0 && w === 0) return;
  for(let i = 0; i < h; i++) {
    let row = "";
    for(let j = 0; j < w; j++) {
      if(i === 0 || i === h - 1) {
        row += '#'
      } else {
        if (j === 0 || j === w - 1) {
          row += '#';
        } else {
          row += ".";
        }
      }
    }
    stack += row + "\n";
  }
  stack += "\n";
})
console.log(stack.trim() + "\n");