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)

BIG_NUM = 2000000000

while True:

    H,W = map(int,input().split())
    if H == 0 and W == 0:
        break
    for i in range(H):
        for k in range(W):
            if i == 0 or i == H-1 or k == 0 or k == W-1:
                print("#",end = "")
            else:
                print(".",end = "")
        print()

    print() #データセットの区切り