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;

class Main{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        int H, W;
        while(true){
            H = scan.nextInt();
            W = scan.nextInt();
            if(H == 0 && W == 0) break;
            drawFrame(H, W);
            System.out.println();
        }
    }
    public static void drawFrame(int H, int W){
        for(int i = 0; i < H; i++){
            for(int k = 0; k < W; k++){
                if(i == 0 || i == H - 1 || k == 0 || k == W - 1){
                    System.out.print("#");
                }else{
                    System.out.print(".");
                }
            }
            System.out.println();
        }
    }
}