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); 

		int h = sc.nextInt();
		int w = sc.nextInt();
		for (; h != 0 || w != 0;) {
			StringBuffer line = new StringBuffer();
			StringBuffer inline = new StringBuffer();
			for (int i = 0; i < w; i++) {
				line.append('#');
				if (i == 0 || i == w -1) {
					inline.append('#');
				} else {
					inline.append('.');
				}
			}
			for (int i = 0; i < h; i++) {
				if (i == 0 || i == h -1) {
					System.out.println(line);
				} else {
					System.out.println(inline);
				}
			}
			System.out.println("");
			
			h = sc.nextInt();
			w = sc.nextInt();
		}
		
		sc.close();
	}
}