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[] arg){
    int H, W;

    Scanner in = new Scanner(System.in);

    while(true){
        H = in.nextInt();
        W = in.nextInt();

        if(H == 0 && W == 0) return;
        
        for(int i=0; i<H; i++){
            for(int j=0; j<W; j++){
                if(i == 0 || i == H-1)
                    System.out.print("#");
                else {
                    if(j == 0 || j == W-1)
                        System.out.print("#");
                    else
                        System.out.print(".");
                }
            }
            System.out.println();
        }
        System.out.println();
    }
    
  }
}