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 x=0; x<W; x++){
            System.out.print('#');
        }
        System.out.println();
        for(int y=1; y<H-1; y++){
            System.out.print('#');
            for(int x=1; x<W-1; x++){
                System.out.print('.');
            }
            System.out.print('#');
            System.out.println();
        }
        for(int x=0; x<W; x++){
            System.out.print('#');
        }
        System.out.println();
        System.out.println();

     }
    }
}