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.*;
import java.util.stream.*;
class Main {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int H,W;
        while(true){
            H = input.nextInt();
            W = input.nextInt();
            if (H == 0 && W == 0){
                break;
            } else {
                for (int i = 0; i < H; i++){
                    if (i == 0 || i == H-1){
                        for (int j = 0; j < W; j++){
                            System.out.printf("#");
                        }
                    } else {
                        System.out.printf("#");
                        for (int j = 1; j < W-1; j++){
                            System.out.printf(".");
                        }
                        System.out.printf("#");
                    }
                    System.out.printf("\n");
                }
                System.out.printf("\n");
            }
        }
    }
}