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 res = require('fs').readFileSync('/dev/stdin','utf8')
    .match(/^[\s\S]*?(?=\n0 0)/g)[0]
    .split('\n')
    .map(r=>r.split(' ')
        .map(Number))
    .map(([H,W])=>[...Array(H).keys()]
        .map((val,i,a)=>((!i || i===Math.max(...a)) ?'#':'.')
            .repeat(W)
            .replace(/(^\.|\.$)/g,'#'))
        .join('\n'))
    .join('\n\n')
    .concat('\n');
console.log(res)