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(); 
            int i,j;
            if (H == 0 && W == 0) { break; } 
            
            for(i=0;i<W;i++){
                System.out.print("#");
            }
            System.out.println("");
            
            for(i=0;i<H-2;i++){
                System.out.print("#");
                for(j=0;j<W-2;j++){
                    System.out.print(".");
                }
                System.out.print("#");
                System.out.println("");
            }
            
            for(i=0;i<W;i++){
                System.out.print("#");
            }
            System.out.println("");
            System.out.println("");
        
        }
    }
}