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 scan = new Scanner(System.in);
		while(true) {
			int H = scan.nextInt();
			int W = scan.nextInt();
			if (H == 0 && W == 0) break;
			for (int i = 0; i < H; i++) {
				for(int k = 0; k < W; k++) {
					if(i == 0 || i == H-1) {
						System.out.print("#");
					}
					else if (i != 0 && (k != 0 && k != W-1)) {
						System.out.print(".");
					}
					else {
						System.out.print("#");
					}
				}
				System.out.println();
			}
			System.out.println();
		}
	}

}