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: Wrong Answer)

import java.util.Scanner;

public class Main{
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    int H = scan.nextInt();
    int W = scan.nextInt();
    StringBuilder sb2 = new StringBuilder();
      for(int i=0;i<W; i++){
        sb2.append("#");
      }
    System.out.println(sb2);
    while(H != 0 || W != 0){
      StringBuilder sb = new StringBuilder();
      for(int i=0; i<W-2; i++ ){
        sb.append(".");
      }
      System.out.print("#");
      for(int j=0; j<H-2; j++){
        System.out.println(sb);
      }
      System.out.print("#");
      System.out.println("");
      H = scan.nextInt();
      W = scan.nextInt();
    }
    System.out.println(sb2); 
  }
}