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 sc = new Scanner(System.in);
		while(true) {
			int H = sc.nextInt();
			int W = sc.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 || j == 0 || j == W -1) {
						System.out.print("#");
					} else if(j > 0 || j < W){
						System.out.print(".");
					}
				}
				System.out.println();
			}
			System.out.println();
		}
	}
}