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 stdIn = new Scanner(System.in);

		while(true){
			int H = stdIn.nextInt();
			int W = stdIn.nextInt();

			if( H == 0 && W == 0) {
				break;
			}

			for (int i = 0; i < H; i ++) {
				for (int j = 0; j < W; j++) {
					if(i == 0 || i == (H-1)) {
						System.out.print("#");
					} else {
						if(j==0 || j ==(W-1)){
							System.out.print("#");
						} else {
							System.out.print(".");
						}
					}
				}
				System.out.println();
			}
			System.out.println();
		}
		stdIn.close();

	}
}