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.InputStreamReader;

public class Main {
	public static void main(String[] args) throws Exception {
		InputStreamReader is = new InputStreamReader(System.in);
		BufferedReader br = new BufferedReader(is);

		while (true) {
			String str = br.readLine();

			String[] num = getElement(str);

			int h = Integer.parseInt(num[0]);
			int w = Integer.parseInt(num[1]);

			if (h == 0 && w == 0) {
				break;
			}
			for (int i = 0; i < h; i++) {
				if(i==0||i==h-1){
					for (int j = 0; j < w; j++) {
						System.out.print("#");
					}
				}else{
					for (int j = 0; j < w; j++) {
						if(j==0||j==w-1){
							System.out.print("#");
						}else{
							System.out.print(".");
						}
					}
				}
				System.out.print("\r\n");
			}
			System.out.print("\r\n");
		}

	}

	//??????????????????????????????????????????
	public static String[] getElement(String element) {
		return (element.split(" "));
	}
}