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 1:
    H,W=map(int,input().split())
    #0 0 ga input saretara owari
    if H==0 and W==0:
        break
    #loop
    #H ga tate, W ga yoko
    for i in range(H):
        #saisho to saigo no gyou ha subete '#'
        if i==0 or i==H-1:
            print('#'*W)
        #sore isgai no gyou ha hidari hashi to migi hashi ga '#' aida ha '.'
        else:
            print('#'+'.'*(W-2)+'#')
    #tugi no sikaku no maeni kaigyou
    print()