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) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner scanner = new Scanner(System.in);
		while (true) {
        // 入力されるH,Wを定義

        int H = scanner.nextInt();
        int W = scanner.nextInt();

        // H,Wともに0の時終了
        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 || j == 0 || j == W - 1) {
        		System.out.print("#");
        		} else {
        			System.out.print(".");
        		}
        	}
        	System.out.println("");
        }
        System.out.println("");
		}
	}

}