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 a=0;a<W;a++){
        System.out.print("#");
      }
      System.out.println("");
      for(int i=0;i<H-2;i++){
        for(int j=0;j<W;j++){
          if(j==0 || j==W - 1){
            System.out.print("#");
          }
          else {
            System.out.print(".");
          }
        }
        System.out.println("");
      }
      for(int a=0;a<W;a++){
        System.out.print("#");
      }
    System.out.println("\n");
    }
  }
}