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

        }
    }
}