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 a = sc.nextInt();
      int b = sc.nextInt();
      if ( a == 0 && b == 0){ break; }
      for (int i = 1; i <= a; i++) {
        for (int j = 1; j <= b; j++){
          if (i == 1 || i == a){
            System.out.print("#");
          } else{
            if (j == 1 || j == b) {
              System.out.print("#");
            } else {
              System.out.print(".");
            }
          }
        }
        System.out.print("\n");
      }
      System.out.print("\n");
    }
  }
}