import java.io.*;

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

			 while(true){
			 String[] line = br.readLine().split(" ");
			int H = Integer.parseInt(line[0]);
			int W = Integer.parseInt(line[1]);
			if(H == 0 && W == 0) break;
			 for(int a = 1; a <= H; a++){
			 		for(int b = 1; b <=W; b++){
			 			if(a == 1 || a == H || b ==1 || b == W){
		 	   				System.out.print("#");
		 	   			} else{
		 	   				System.out.print(".");
		 	   			}
		 	   		}
	 	   			System.out.print("\n");	
	 	   	 }
	 	   	System.out.print("\n");
	 	   	}
	 	   	} catch(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