import java.util.*;

public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		for(;;){
			int H = sc.nextInt();
			int W = sc.nextInt();
			
			if(H == 0 && W == 0)
				break;
		
			for(int i = 0;i < H;i++){
				if(i == 0 || i == H - 1){
					for(int j = 0;j < W;j++){
						System.out.print("#");
					}
				}else{
					for(int j = 0;j < W;j++){
						if(j == 0 || j == W - 1)
							System.out.print("#");
						else
							System.out.print(".");
					}
				}
					System.out.print("\n");
				}
			System.out.print("\n");
		}
	}
} import java.util.*; util.* java public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		for(;;){
			int H = sc.nextInt();
			int W = sc.nextInt();
			
			if(H == 0 && W == 0)
				break;
		
			for(int i = 0;i < H;i++){
				if(i == 0 || i == H - 1){
					for(int j = 0;j < W;j++){
						System.out.print("#");
					}
				}else{
					for(int j = 0;j < W;j++){
						if(j == 0 || j == W - 1)
							System.out.print("#");
						else
							System.out.print(".");
					}
				}
					System.out.print("\n");
				}
			System.out.print("\n");
		}
	}
} Main public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		for(;;){
			int H = sc.nextInt();
			int W = sc.nextInt();
			
			if(H == 0 && W == 0)
				break;
		
			for(int i = 0;i < H;i++){
				if(i == 0 || i == H - 1){
					for(int j = 0;j < W;j++){
						System.out.print("#");
					}
				}else{
					for(int j = 0;j < W;j++){
						if(j == 0 || j == W - 1)
							System.out.print("#");
						else
							System.out.print(".");
					}
				}
					System.out.print("\n");
				}
			System.out.print("\n");
		}
	} main {
		Scanner sc = new Scanner(System.in);
		
		for(;;){
			int H = sc.nextInt();
			int W = sc.nextInt();
			
			if(H == 0 && W == 0)
				break;
		
			for(int i = 0;i < H;i++){
				if(i == 0 || i == H - 1){
					for(int j = 0;j < W;j++){
						System.out.print("#");
					}
				}else{
					for(int j = 0;j < W;j++){
						if(j == 0 || j == W - 1)
							System.out.print("#");
						else
							System.out.print(".");
					}
				}
					System.out.print("\n");
				}
			System.out.print("\n");
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) for(;;){
			int H = sc.nextInt();
			int W = sc.nextInt();
			
			if(H == 0 && W == 0)
				break;
		
			for(int i = 0;i < H;i++){
				if(i == 0 || i == H - 1){
					for(int j = 0;j < W;j++){
						System.out.print("#");
					}
				}else{
					for(int j = 0;j < W;j++){
						if(j == 0 || j == W - 1)
							System.out.print("#");
						else
							System.out.print(".");
					}
				}
					System.out.print("\n");
				}
			System.out.print("\n");
		} ; {
			int H = sc.nextInt();
			int W = sc.nextInt();
			
			if(H == 0 && W == 0)
				break;
		
			for(int i = 0;i < H;i++){
				if(i == 0 || i == H - 1){
					for(int j = 0;j < W;j++){
						System.out.print("#");
					}
				}else{
					for(int j = 0;j < W;j++){
						if(j == 0 || j == W - 1)
							System.out.print("#");
						else
							System.out.print(".");
					}
				}
					System.out.print("\n");
				}
			System.out.print("\n");
		} {
			int H = sc.nextInt();
			int W = sc.nextInt();
			
			if(H == 0 && W == 0)
				break;
		
			for(int i = 0;i < H;i++){
				if(i == 0 || i == H - 1){
					for(int j = 0;j < W;j++){
						System.out.print("#");
					}
				}else{
					for(int j = 0;j < W;j++){
						if(j == 0 || j == W - 1)
							System.out.print("#");
						else
							System.out.print(".");
					}
				}
					System.out.print("\n");
				}
			System.out.print("\n");
		} int H = sc.nextInt(); H sc.nextInt() sc.nextInt sc int W = sc.nextInt(); W sc.nextInt() sc.nextInt sc if(H == 0 && W == 0)
				break; H == 0 && W == 0 H == 0 H 0 W == 0 W 0 break; for(int i = 0;i < H;i++){
				if(i == 0 || i == H - 1){
					for(int j = 0;j < W;j++){
						System.out.print("#");
					}
				}else{
					for(int j = 0;j < W;j++){
						if(j == 0 || j == W - 1)
							System.out.print("#");
						else
							System.out.print(".");
					}
				}
					System.out.print("\n");
				} int i = 0; int i = 0; i 0 i < H i H i++ i++ i {
				if(i == 0 || i == H - 1){
					for(int j = 0;j < W;j++){
						System.out.print("#");
					}
				}else{
					for(int j = 0;j < W;j++){
						if(j == 0 || j == W - 1)
							System.out.print("#");
						else
							System.out.print(".");
					}
				}
					System.out.print("\n");
				} {
				if(i == 0 || i == H - 1){
					for(int j = 0;j < W;j++){
						System.out.print("#");
					}
				}else{
					for(int j = 0;j < W;j++){
						if(j == 0 || j == W - 1)
							System.out.print("#");
						else
							System.out.print(".");
					}
				}
					System.out.print("\n");
				} if(i == 0 || i == H - 1){
					for(int j = 0;j < W;j++){
						System.out.print("#");
					}
				}else{
					for(int j = 0;j < W;j++){
						if(j == 0 || j == W - 1)
							System.out.print("#");
						else
							System.out.print(".");
					}
				} i == 0 || i == H - 1 i == 0 i 0 i == H - 1 i H - 1 H 1 {
					for(int j = 0;j < W;j++){
						System.out.print("#");
					}
				} for(int j = 0;j < W;j++){
						System.out.print("#");
					} int j = 0; int j = 0; j 0 j < W j W j++ j++ j {
						System.out.print("#");
					} {
						System.out.print("#");
					} System.out.print("#") System.out.print System.out System System.out "#" {
					for(int j = 0;j < W;j++){
						if(j == 0 || j == W - 1)
							System.out.print("#");
						else
							System.out.print(".");
					}
				} for(int j = 0;j < W;j++){
						if(j == 0 || j == W - 1)
							System.out.print("#");
						else
							System.out.print(".");
					} int j = 0; int j = 0; j 0 j < W j W j++ j++ j {
						if(j == 0 || j == W - 1)
							System.out.print("#");
						else
							System.out.print(".");
					} {
						if(j == 0 || j == W - 1)
							System.out.print("#");
						else
							System.out.print(".");
					} if(j == 0 || j == W - 1)
							System.out.print("#");
						else
							System.out.print("."); j == 0 || j == W - 1 j == 0 j 0 j == W - 1 j W - 1 W 1 System.out.print("#") System.out.print System.out System System.out "#" System.out.print(".") System.out.print System.out System System.out "." System.out.print("\n") System.out.print System.out System System.out "\n" System.out.print("\n") System.out.print System.out System System.out "\n" String[] args args public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		for(;;){
			int H = sc.nextInt();
			int W = sc.nextInt();
			
			if(H == 0 && W == 0)
				break;
		
			for(int i = 0;i < H;i++){
				if(i == 0 || i == H - 1){
					for(int j = 0;j < W;j++){
						System.out.print("#");
					}
				}else{
					for(int j = 0;j < W;j++){
						if(j == 0 || j == W - 1)
							System.out.print("#");
						else
							System.out.print(".");
					}
				}
					System.out.print("\n");
				}
			System.out.print("\n");
		}
	}
} public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		for(;;){
			int H = sc.nextInt();
			int W = sc.nextInt();
			
			if(H == 0 && W == 0)
				break;
		
			for(int i = 0;i < H;i++){
				if(i == 0 || i == H - 1){
					for(int j = 0;j < W;j++){
						System.out.print("#");
					}
				}else{
					for(int j = 0;j < W;j++){
						if(j == 0 || j == W - 1)
							System.out.print("#");
						else
							System.out.print(".");
					}
				}
					System.out.print("\n");
				}
			System.out.print("\n");
		}
	}
} Main
import java.util.*;

public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		for(;;){
			int H = sc.nextInt();
			int W = sc.nextInt();
			
			if(H == 0 && W == 0)
				break;
		
			for(int i = 0;i < H;i++){
				if(i == 0 || i == H - 1){
					for(int j = 0;j < W;j++){
						System.out.print("#");
					}
				}else{
					for(int j = 0;j < W;j++){
						if(j == 0 || j == W - 1)
							System.out.print("#");
						else
							System.out.print(".");
					}
				}
					System.out.print("\n");
				}
			System.out.print("\n");
		}
	}
}