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);
        int a = 0;
        int b = 0;
        while (true) {
            a = sc.nextInt();
            b = sc.nextInt();
            if (a == 0 && b == 0) {
                break;
            }
            for (int i = 0; i < a; i++) {
                for (int j = 0; j < b; j++) {
                    if (i == 0 || j == 0 || i == (a - 1) || j == (b - 1)) {
                        System.out.print("#");
                    } else {
                        System.out.print(".");
                    }
                }
                System.out.print("\n");
            }
            System.out.print("\n");
        }

    }
}