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 = []
while(True):
    x,y = map(int,input().split())
    if x == 0 and y == 0:
        break
    else:
        H.append(x)
        W.append(y)
for i in range(len(H)):
    for j in range(H[i]):#行数
        if j == 0:#上段
            print(W[i]*"#")
            
        elif j+1 == H[i]:#下段
            print(W[i]*"#"+"\n")
            
        else:#中段
            print("#"+(W[i]-2)*"."+"#")#列数