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.InputStream;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
	public static void main(String[] args) throws IOException{
		InputReader in = new InputReader(System.in);
		
		while (true) {
			int height = in.readInt();
			int width = in.readInt();
			if (height == 0 && width == 0) break;
			
			StringBuffer sBuffer = new StringBuffer(width);
			StringBuffer sBufferWithDot = new StringBuffer(width);
			for (int j = 0; j < width; j++) {
				sBuffer.append("#");
				
				if (j == 0 || j == width - 1) {
					sBufferWithDot.append("#");
				}else {
					sBufferWithDot.append(".");
				}
			}
			
			
			for (int i = 0; i < height; i++) {
				if(i == 0 || i == height - 1) {
					System.out.println(sBuffer.toString());
				}else {
					System.out.println(sBufferWithDot.toString());
				}
				
			}
			System.out.println();
		}
	}
}

class InputReader{
	private BufferedReader br;
	private StringTokenizer buffer = null;	
	
	public InputReader(InputStream in) {
		br = new BufferedReader(new InputStreamReader(in));				
	}

	public String read() throws IOException {
		while(buffer == null || !buffer.hasMoreTokens()) {
			buffer = new StringTokenizer(br.readLine());
		}
		return buffer.nextToken();
	}
	
	public int readInt() throws IOException {
		while(buffer == null || !buffer.hasMoreTokens()) {
			buffer = new StringTokenizer(br.readLine());
		}
		return Integer.parseInt(buffer.nextToken());
	}
}