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 s = new Scanner(System.in);
	int H = s.nextInt();
	int W = s.nextInt();

	while(H != 0 || W != 0){
	    for(int i = 0; i < H; i++){
		for(int j = 0; j < W; j++){
		    if(i == 0 || i == H-1) System.out.print("#");
		    else if(j == 0 || j == W-1) System.out.print("#");
		    else System.out.print(".");
		}
		System.out.println();
	    }
	    System.out.println();

	    H = s.nextInt();
	    W = s.nextInt();
	}
    }
}