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 scanner = new Scanner(System.in);
        while(true) {
            int h = scanner.nextInt();
            int w = scanner.nextInt();
            if (h == 0 && w == 0) break;
            for (int i = 0; i < w; i++) {
                System.out.print("#");
            }
            System.out.print("\n");
            for (int i = 0; i < h - 2; i++) {
                System.out.print("#");
                for (int j = 0; j < w - 2; j++) {
                    System.out.print(".");
                }
                System.out.print("#");
                System.out.print("\n");
            }
            for (int i = 0; i < w; i++) {
                System.out.print("#");
            }
            System.out.print("\n");
            System.out.print("\n");
        }
        scanner.close();
    }
}