import java.io.InputStreamReader;
import java.util.Scanner;
public class Main{
	public static void main (String args[]){
		Scanner sc=new Scanner(new InputStreamReader(System.in));
		while(true){
			int h=sc.nextInt();
			int w=sc.nextInt();
			if(h==0&&w==0) break;
			for(int i=0;i<w;i++) System.out.print("#");	
			System.out.println("");
			for(int i=2;i<=h-1;i++){
				System.out.print("#");
				for(int j=2;j<=w-1;j++) System.out.print(".");
				System.out.print("#");
				System.out.println("");
			}
			for(int i=0;i<w;i++) System.out.print("#");
			System.out.println("");
			System.out.println("");
		}
		sc.close();
	}
}
/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