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();
		}
	}
} import java.util.Scanner; Scanner java.util 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();
		}
	}
} 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();
		}
	} main {
		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();
		}
	} Scanner scan = new Scanner(System.in); scan new Scanner(System.in) int H H W; W H = scan.nextInt() H scan.nextInt() scan.nextInt scan W = scan.nextInt() W scan.nextInt() scan.nextInt scan 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();
		} H != 0 && W != 0 H != 0 H 0 W != 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();
		} 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");
			} int i = 0; int i = 0; i 0 i < H i H i++ i++ 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");
			} {
				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");
			} 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(".");
				} int j = 0; int j = 0; j 0 j < W j W j++ j++ j {
					if(i == 0 || j == 0 || i == H-1 || j == W-1)
						System.out.printf("#");
					else
						System.out.printf(".");
				} {
					if(i == 0 || j == 0 || i == H-1 || j == W-1)
						System.out.printf("#");
					else
						System.out.printf(".");
				} if(i == 0 || j == 0 || i == H-1 || j == W-1)
						System.out.printf("#");
					else
						System.out.printf("."); i == 0 || j == 0 || i == H-1 || j == W-1 i == H-1 i == 0 || j == 0 || i == H-1 || j == W-1 i == 0 i 0 j == 0 j 0 i == H-1 i H-1 H 1 j == W-1 j W-1 W 1 System.out.printf("#") System.out.printf System.out System System.out "#" System.out.printf(".") System.out.printf System.out System System.out "." System.out.printf("\n") System.out.printf System.out System System.out "\n" System.out.printf("\n") System.out.printf System.out System System.out "\n" H = scan.nextInt() H scan.nextInt() scan.nextInt scan W = scan.nextInt() W scan.nextInt() scan.nextInt scan String[] args args 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();
		}
	}
} 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();
		}
	}
} Main
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();
		}
	}
}