import java.util.Scanner;

public class Main{

	public static void main(String[] args) {

		int g,r;

		Scanner scan = new Scanner(System.in);

		while(true)
		{
			g = scan.nextInt();
			r = scan.nextInt();

			if( (g|r) == 0) break;

			for(int i=0; i<g; i++)
			{
				for(int j=0; j<r; j++)
				{
					if(i==0 || i==(g-1) )//Line0 or LastLine
					{
						System.out.print("#");
					}
					else
					{
						if(j==0 || j==(r-1) ) System.out.print("#");
						else System.out.print(".");
					}
				}

				System.out.println();
			}

			System.out.println();

		}

		scan.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