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)

a=[]
i=0
while 1:
    l=input().split()

    h=int(l[0])
    w=int(l[1])

    if h==0 and w==0:
        break
    else:
        a.append(h-2)
        a.append(w-2)
        i=i+2

m=0
while m<i:
    w=a[m+1]+2
    print(w*"#")
    while a[m]>0:
        print("#"+a[m+1]*"."+"#")
        a[m]=a[m]-1
    print(w*"#")
    print("")
    m=m+2