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 Python3 (judge verdict: Accepted)

while True:
    H, W = map(int, input().split(' '))
    if H == W == 0:
        break
    edge = ['#'*W]
    middle = ['#'+'.'*(W-2)+'#']
    box = []
    box.append(edge)
    for i in range(H-2):
        box.append(middle)
    box.append(edge)
    
    for items in box:
        print(items[0])
    print('')