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) {
		try (Scanner sc = new Scanner(System.in)) {

			while (true) {
				int a = sc.nextInt(); //第一入力
				int b = sc.nextInt(); //第二入力
				char output[][] = new char[a][b];
				if(a == 0 && b == 0) {
					break; //00のときループを抜ける
				}
				for(int i = 0; i < a; i++) {
					for(int j = 0; j < b; j++) {
						if(((1 <= i) && (i < a - 1)) && ((1 <= j) && (j < b - 1))){
							output[i][j] = '.';
						}else {
							output[i][j] = '#';
						}
						System.out.print(output[i][j]);
					}
					System.out.println(); //改行
				}
				System.out.println(); //改行
			}
		}
	}
}