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);

        while(true){
            int H = sc.nextInt();
            int W = sc.nextInt();

            if(H == 0 && W == 0){
                break;
            }

            for(int i=1;i<=W;i++){
                System.out.print("#");
            }
            System.out.println();

            for(int i=1;i<=H-2;i++){
                System.out.print("#");
                for(int j=1;j<=W-2;j++){
                    System.out.print(".");
                }
                System.out.println("#");
            }

            for(int i=1;i<=W;i++){
                System.out.print("#");
            }
            System.out.println();
            System.out.println();

        }
        sc.close();

    }

}