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.ArrayList;
import java.util.Scanner;

public class Main {
	/**
	 * ????????????????????????
	 * @param h
	 * @param w
	 * @return
	 */
	public static int exception(int h,int w){
		int result = 0;
		if(3 <= h && h <= 300 && 3 <= w && w <= 300){ //??????????????????(??\????¶???????)
			result = 2;
		}
		else if(h == 0 && w == 0){
			result = 1; //0,0??\?????§??\???????????????
		}
		else{
			System.out.println("3~300????????§??\?????????????????????.???????????????.");
			result = 0;
		}
		return result;
	}
	public static void main(String[] args) {
		/**
		 * ?????°?????£?¨?
		 */
		int a = 0;
		int t = 0, inc = 0;
		int h = 0,w = 0; //height:h width:w
		int x = 0;
		/**
		 * ???????????£?¨?
		 */
		ArrayList<String> st = new ArrayList<String>();
		ArrayList<Integer> parse = new ArrayList<Integer>();
		/**
		 * ????¨???????????????\???
		 */
		Scanner scan = new Scanner(System.in);
		while(a == 0){
		for (t = 0; t < 2; t++){ //??´??°2???????????????
		st.add(scan.next());
		}
		h = Integer.parseInt(st.get(inc));
		w = Integer.parseInt(st.get(inc+1));
		parse.add(h);
		parse.add(w);
		if(exception(h,w) == 1){ //h=w=0?????¨??????????????????????????????
			break;
		}
		else if(exception(h,w) == 0){ //??????????????????????????????.
			System.exit(0);
		}
		inc = inc + 2; //???????????§?????°
		}
		/**
		 * ??????
		 */
		for(int n= 1; n < ((parse.size())/2) ; ++n){ //???????????°??????
		 for(int i = 0; i < parse.get(2*(n-1)); ++i){ //hight
			for(int j = 0; j < parse.get(2*n-1); ++j){ //width
				if(i == 0 || i == parse.get(2*(n-1))-1){
				System.out.print("#");
				}
				else if(j == 0 || j == parse.get(2*n-1)-1){
					System.out.print("#");
				}
				else{
					System.out.print(".");
				}
			}
			System.out.println("");
		 }
		 System.out.println("");
		}
	}
}