import java.io.IOException;
import java.util.Scanner;
public class Main {

	public static void main(String[] args) throws Exception {
		// TODO ?????????????????????????????????????????????
		int a,b,c,d,e;
		   a=1;b=1;e=1;
	       Scanner sc = new Scanner(System.in);
	       while (a!=0 || b!=0){
	       a = sc.nextInt();
	       b = sc.nextInt();
	       c = 1;
	       d = 1;
	       if (e != 1){
	    	   System.out.println();
	       }
	       
	       while(c<=a){
	    	   
	    	   if(c==1||c==a){
	    		   
	    		   while(d<=b){
	    			   if(d!=b){
	    				   System.out.print("#");
	    			   }
	    			   else{
	    				   System.out.println("#");
	    			   }
	    		   d=d+1;
	    		   }
	    		   
	    	   }
	    	   
	    	   else{
	    		   
	    	   while(d<=b){
	    		   
	    		   if(d==1){
	    			   System.out.print("#");
	    		   }else if(d==b){
	    			   System.out.println("#");
	    		   }
	    		   else{
	    			   System.out.print(".");
	    		   }
	    		   
	    		   d = d+1;
	    	   }
	    	   
	    	   }
	    	   
	    	   c = c+1;
	    	   d = 1;
	       }
	       e=e+1;
	       }
		}

    }
/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