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 Python (judge verdict: Accepted)

import sys

while True:
	data = map(int, raw_input().split())
	H = data[0]
	W = data[1]
	
	if H == 0 and W == 0:
		break
	else:
		for i in range(H):
			if i == 0 or i == H-1:
				for j in range(W):
					sys.stdout.write("#")
				print("")
			else:
				sys.stdout.write("#")
				for j in range(W-2):
					sys.stdout.write(".")
				sys.stdout.write("#")
				print("")
		print("")