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 {
	static int height = 0;
	static int weight = 0;

	public static void main(String[] args) throws Exception {
		// TODO ?????????????????????????????????????????????
		boolean zeroFlag = true;
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String line = br.readLine();

		while (zeroFlag) {
			String[] nyuryokuStr = line.split("[\\s]+");
			height = Integer.parseInt(nyuryokuStr[0]);
			weight = Integer.parseInt(nyuryokuStr[1]);
			if (height == 0 && weight == 0) {
				zeroFlag = false;
			} else {
				for (int h = 0; h < height; h++) {
					for (int w = 0; w < weight; w++) {
						if( (w == 0 || h == 0) ||
							 (w == weight - 1 || h == height - 1)) {
								System.out.print("#");

						} else {
							System.out.print(".");
						}
					}
					System.out.println();
				}
				System.out.println();
			}
			line = br.readLine();
		}
	}
}