import java.util.Scanner;
public class Main
{
	public static void main( String args[] )
	{
		Scanner input = new Scanner(System.in);
		int h, w;
		while(true)
		{
			h=input.nextInt();
			w=input.nextInt();
			if(h == 0 && w == 0)
				break;
			else {
				for(int i = 0; i < h; i++)
				{
					for(int k = 0; k < w; k++)
					{
						if(i == 0 || i == h-1 || k == 0 || k == w-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