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.*;
 
class Main {
        public static void main(String args[]) {
                try (Scanner sc = new Scanner(System.in)) {
                        while (true) {
                                int H = sc.nextInt(), 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 || j == 0 || i == H - 1 || j == W - 1) {
                                                        System.out.print("#");
                                                } else {
                                                        System.out.print(".");
                                                }
                                        }
                                        System.out.println("");
                                }
                                System.out.println("");
                        }
                }
        }
}