import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);

		int H[]=new int[256];
		int W[]=new int[256];

		int i=0;
		while(true){
			H[i]=sc.nextInt();
			W[i]=sc.nextInt();

			if(H[i]==0&&W[i]==0)	break;
			i++;
		}

		for(int x=0;x<i;x++){
			for(int j=0;j<H[x];j++){
				for(int k=0;k<W[x];k++){
					if(j==0||j==H[x]-1||k==0||k==W[x]-1)	System.out.print("#");
					else	System.out.print(".");
				}
				System.out.println();
			}
			System.out.println();
		}
	}
}
/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