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 scanner = new Scanner(System.in)) {
            int a, b;
            while ((a = scanner.nextInt()) != 0 && (b = scanner.nextInt()) != 0) {
                for (int i = 0; i < a; i++) {
                    for (int j = 0; j < b; j++) {
                        if (i == 0 || i == a - 1 || j == 0 || j == b - 1) {
                            System.out.print("#");
                        } else {
                            System.out.print('.');
                        }
                    }
                    System.out.println();
                }
                System.out.println();
            }
        }
    }
}