import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		int h=sc.nextInt();
		int w=sc.nextInt();
		while (h!=0||w!=0){
			StringBuilder sb1=new StringBuilder("");
			for(int m=0;m<w;m++)sb1.append("#");
			sb1.append("\n");
			for(int n=0;n<h-2;n++){
				sb1.append("#");
				for(int m=0;m<w-2;m++)sb1.append(".");
				sb1.append("#");
				sb1.append("\n");
			}
			for(int m=0;m<w;m++)sb1.append("#");
			sb1.append("\n");
			System.out.println(sb1);
			h=sc.nextInt();
			w=sc.nextInt();
		}
	}
}
/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