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.util.Scanner;

public class Main {
	public static void main(String[] args){
		Scanner std = new Scanner(System.in);
		while(true){
			int h = Integer.parseInt(std.next());
			int w = Integer.parseInt(std.next());
			if(h!=0 && w!=0){
				String line = "";
				String line2 = "#";
				for(int m=1; m<=w; m++){
					line += "#";
					line2 += ".";
				}
				line2 = line2.substring(0, w-1)+"#";
				System.out.println(line);
				for(int n=2; n<=h-1; n++){
					System.out.println(line2);
				}
				System.out.println(line);
				System.out.println();
			}else break;
		}
	}
}