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)

H = ''
W = ''
i = j = 0

while True:
  line = input()
  line = line.split()
  H = int(line[0])
  W = int(line[1])

  if H == 0 and W == 0:
    break

  while i < H:
    if i == 0 or i == H-1:
      print('#'*W)
    else:
      print('#',end='')
      print('.'*(W-2),end='')
      print('#')
    i += 1
  i = 0
  print()