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)

from __future__ import print_function
while(1):
    x = raw_input()
    if(x == "0 0"):
        break
    x = x.split(" ")
    h = int(x[0])
    w = int(x[1])
    for j in range(0,w):
        print("#", end="")
    print("\n",end="")
    for i in range(0,h-2):
        print("#",end="")
        for k in range(0,w-2):
            print(".", end="")
        print("#")
    for l in range(0,w):
        print("#", end="")
    print("\n",end="")
    print("\n",end="")