import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int H,W;
		H = scan.nextInt();
		W = scan.nextInt();

		while(H != 0 && W != 0){
			for(int i = 0; i < H; i++){
				for(int j = 0; j < W; j++){
					if(i == 0 || j == 0 || i == H-1 || j == W-1)
						System.out.printf("#");
					else
						System.out.printf(".");
				}
				System.out.printf("\n");
			}
			System.out.printf("\n");
			H = scan.nextInt();
			W = scan.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