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==0 and w==0:
        break

    for i in range(h):
        wid=''
        if i==0 or i==h-1:
            for l in range(w):  
                wid+='#'
            print(wid)
        
        else :
            wid+='#'
            for k in range(1,w-1):
                wid+='.'
            wid+="#"
            print(wid)
    print("")