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').split(/\n/);
for (let i = 0; i < input.length; i++) {
    let [a, b] = input[i].split(' ').map(Number);
     if (a === 0 && b === 0) {
        break;
         }
    for (let j = 0; j < a; j++) {
        if (j === 0) {
           console.log('#'.repeat(b));
        }
        if (j === a - 2) {
           console.log('#'.repeat(b));
           break;
        }
        console.log('#' + '.'.repeat(b - 2) + '#');
    }
    console.log('');
}