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.*;

class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringBuilder sb = new StringBuilder();
		while (true) {
			String[] cut = br.readLine().split(" ");
			int H = Integer.parseInt(cut[0]);
			int W = Integer.parseInt(cut[1]);
			if (H == 0 && W == 0){
				break;
			}
			for (int i = 0; i < W; i++) {
				sb.append("#");

			}
			sb.append("\n");
			for (int k = 0; k < H-2; k++) {
				sb.append("#");
				for (int j = 0; j < W - 2; j++) {
					sb.append(".");
				}
				sb.append("#");
				sb.append("\n");
			}
			for (int i = 0; i < W; i++) {
				sb.append("#");
			}
			sb.append("\n");
			sb.append("\n");
		}
		System.out.print(sb);

	}

}