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.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) {
		BufferedReader input = new BufferedReader(new InputStreamReader(System.in));


		  try{


			  while(true){
				  //????????\???
			     String ab = input.readLine();
		         String []strAry = ab.split(" ");
		         int  a=Integer.parseInt(strAry[0]);
	             int b=Integer.parseInt(strAry[1]);
	             int count=0;
	             int countb=0;
	              if(a==0&&b==0){
	        	      break;
	               }
	                  //a?????°?????????
	                  for(int i=0; i<a; i++){
	                	  //countb????????????????????¨??§else???????????????????????????
	                	  countb=0;
	        	          for(int j=0; j<b; j++){
	        	        	  //count???????????????a???????????????
	        	        	  if(count==a-1||count==0){
	        	        		  //????????????,??????????????¨??????????????????????????????????????????
	        	                 System.out.print('#');
	        	                 //count???????????\????????????????????¨??????????????\?????????
	        	        	  }else{
	        	        		  //countb??????????????¨????????????????????????????????????
	        	        		  countb++;
	        	        		  //countb???????????????????????????
	        	        		  if(countb==1||countb==b){
	        	        			  System.out.print('#');
	        	        			  //countb???????????\???
	        	        		  }else{
                                       System.out.print('.');
	        	        		  }
	        	        	  }


	        	           }
	        	          count++;
	        	          System.out.println("");

	                  }


	                  System.out.println("");
	              }



		    }catch(IOException e) {   System.out.println("Exception : " + e);
		    }

	}
}