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;

class Main{
	public static void main(String[] args) 	{
		Scanner sc = new Scanner(System.in);
		while(0 < 1){
			int a = sc.nextInt();
			int b = sc.nextInt();
			if(a == 0 && b == 0) break;
			//上のフレーム
			for(int i = 0;i < b;i++) {
				System.out.printf("#");
			}
			System.out.printf("\n");
			//真ん中
			for(int j = 2;j < a;j++ ) {
				System.out.printf("#");
				for(int k = 2;k < b;k++) {
					System.out.printf(".");
				}
				System.out.printf("#\n");
			}
			//下のフレーム
			for(int i = 0;i < b;i++) {
				System.out.printf("#");
			}
			System.out.printf("\n\n");
		}
		sc.close();
	}	
}