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);
		    }

	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz