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.io.*;
public class Main{
	public static void main(String[] args)throws Exception{
		BufferedReader input=new BufferedReader(new InputStreamReader(System.in));
		StringBuilder sb=new StringBuilder();
		while(true){
		String str=input.readLine();
		String[] arr=str.split(" ");
		int h=Integer.parseInt(arr[0]);	
		int w=Integer.parseInt(arr[1]);
		if(h==0&&w==0){
			break;
		}
	
		for(int i=0;i<h;i++){

			for(int j=0;j<w;j++){
				if(i==0||i==h-1||j==0||j==w-1){
				sb.append("#");
				}else{
					sb.append(".");
				}
			}
				sb.append("\n");
		}
			sb.append("\n");

			}
		
		
		
		System.out.print(sb);
	}
}