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.io.*;
import java.util.*;
public class Main{
	public static void main(String args[]) throws Exception{
		Scanner cin= new Scanner(System.in);
		while(true){
			int H= cin.nextInt();
			int W= cin.nextInt();
			
			if( H==0 && W==0 ){
				break;
			}
			else{
				int i,j;
				for(i=0;i<H;i++){
					if( i==0 || i==H-1 ){
						for(j=0;j<W;j++){
							System.out.print("#");
						}
					}
					else{
						for(j=0;j<W;j++){
							if( j==0 || j==W-1 ){
								System.out.print("#");
							}
							else{
								System.out.print(".");
							}
						}
					}
					System.out.print("\n");
				}
			}
			System.out.println();
		}
	}
}