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 IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		while(true){
			String[] str = br.readLine().split(" ");
			int H = Integer.parseInt(str[0]);
			int W = Integer.parseInt(str[1]);
			if(H==0 && W==0)break;
			/*System.out.print("\n");
		
			for(int i=0; i<W; i++){
				System.out.print("#");
			}
			System.out.print("\n");
			for(int j=0; j<H-2; j++){

				System.out.print("#");
				for(int i=0; i<W-2; i++){
					System.out.print(".");
				}
				System.out.print("#");
				System.out.print("\n");
			}
			
			for(int i=0; i<W; i++){
				System.out.print("#");
			}
			System.out.print("\n"); */
			
			for(int i=0; i<H; i++){
				for(int j=0;j<W; j++){
					if(i==0 || j==0 || i==H-1 ||j==W-1){
						System.out.print("#");
					}else{
						System.out.print(".");
					}
				}
				System.out.print("\n");
			}
			System.out.print("\n");
		}	
	}

}