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 JAVA (judge verdict: Accepted)

import java.util.Scanner;

public class Main{
	public static void main(String[] args){
		//????????£?????????????????????
		Scanner sc = new Scanner(System.in);

		//?°?????????????
		while(true){
			//H??????????????????
			int H = sc.nextInt();
			//W?¨????????????????
			int W = sc.nextInt();
			//H??¨W???0????????????
			if(H == 0 && W == 0){
				break;
			}
			//???????????¨???
			for(int i = 1; i <= H; i++){
				//?¨?????????¨???
				for(int j = 1; j <= W; j++){
					//?????¶???
					if(i == 1 || i == H || j==1|| j == W){
						System.out.print('#');
					}else{
						System.out.print('.');
					}
				}
				System.out.println();
			}
			System.out.println();
		}
	}
}