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.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) throws IOException {
		
		int H = 0;
		int W = 0;
		
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		while (true) {
			String str = br.readLine();
			String[] num = str.split(" ");

			H = Integer.parseInt(num[0]);
			W = Integer.parseInt(num[1]);

			if (H == 0 && W == 0) {
				break;
			}
			for (int i = 0; i < H; i++) {
				for (int j = 0; j < W - 1; 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();
		}
		
	}
}