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[] args){
	final 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=0;i<a;i++){
		for(int j=0;j<b;j++){
		    if(i==0||j==0||i==a-1||j==b-1) System.out.print("#");
		    else System.out.print(".");
		}
		System.out.println("");
	    }
	    System.out.println("");
	}
    }
}