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) {
		StringBuilder sb = new StringBuilder();
		Scanner scan = new Scanner(System.in);
		while(true){
		//Scanner scan = new Scanner(System.in);


		int H = scan.nextInt();
	    int W = scan.nextInt();


	    if(H == 0 && W == 0)break;
	    for(int i = 1;i <= H ;i++){
	    	for(int j = 1;j <= W; j++){
	    		if((i == 1 || j == 1) || i == H || j == W){
	    			//sb.append("#");
	    			System.out.print("#");
	    		}else{
	    			//sb.append(".");
	    			System.out.print(".");
	    		}

	    	}
	    	System.out.println();
	    	//sb.append("\n");
	    }
	    //sb.append("\n");
	    System.out.println();
	   }
		//System.out.print(sb);

	}

}