import java.io.*;

class Main {
    public static void main(String[] args) {
    	
    	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    	boolean end = false;
		try {
			while(end == false){
				//??\?????????????????????
		    	String temp = br.readLine();
		    	String[] numbers = temp.split(" ");//????????¨??????????????????
		    	int H = Integer.parseInt(numbers[0]);;//??????
		    	int W = Integer.parseInt(numbers[1]);;//???
		    	
		    	if(H <= 300  && H >= 3 && W <= 300 &&  W >= 3){
			    	//????§???¢??????????????????
			    	for(int i = 0; i < H ; i++){
			    		
			    		if(i == 0 || i == H - 1){
				    		for(int j = 0; j < W ; j++){
				    			System.out.print("#");
				    		}
			    		}else{
			    			System.out.print("#");
				    		for(int j = 1; j < W - 1; j++){
				    			System.out.print(".");
				    		}
				    		System.out.print("#");
			    		}

			    		System.out.println();//?¬??????????
			    	}
			    	System.out.println();//??????

		    	}else if(H == 0 && W == 0){
		    		end = true;//HW?????????0??????????????????
		    	}
			}
	    	
		} catch (IOException e) {
			// TODO ????????????????????? catch ????????????
			e.printStackTrace();
		}
    }
 }
/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