import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		while (true) {
			int a = scanner.nextInt();
			int b = scanner.nextInt();
			if (a == 0 & b == 0)
				break;
			for (int i = 0; i < a; i++) {
				for (int j = 0; j < b; j++) {
					if(i==0||i == a-1)
						System.out.print("#");
					else if(j==0||j==b-1)
						System.out.print("#");
					else
						System.out.print(".");
				}
				System.out.println();
			}
			System.out.println();
		}
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		while (true) {
			int a = scanner.nextInt();
			int b = scanner.nextInt();
			if (a == 0 & b == 0)
				break;
			for (int i = 0; i < a; i++) {
				for (int j = 0; j < b; j++) {
					if(i==0||i == a-1)
						System.out.print("#");
					else if(j==0||j==b-1)
						System.out.print("#");
					else
						System.out.print(".");
				}
				System.out.println();
			}
			System.out.println();
		}
	}
} Main public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		while (true) {
			int a = scanner.nextInt();
			int b = scanner.nextInt();
			if (a == 0 & b == 0)
				break;
			for (int i = 0; i < a; i++) {
				for (int j = 0; j < b; j++) {
					if(i==0||i == a-1)
						System.out.print("#");
					else if(j==0||j==b-1)
						System.out.print("#");
					else
						System.out.print(".");
				}
				System.out.println();
			}
			System.out.println();
		}
	} main {
		Scanner scanner = new Scanner(System.in);
		while (true) {
			int a = scanner.nextInt();
			int b = scanner.nextInt();
			if (a == 0 & b == 0)
				break;
			for (int i = 0; i < a; i++) {
				for (int j = 0; j < b; j++) {
					if(i==0||i == a-1)
						System.out.print("#");
					else if(j==0||j==b-1)
						System.out.print("#");
					else
						System.out.print(".");
				}
				System.out.println();
			}
			System.out.println();
		}
	} Scanner scanner = new Scanner(System.in); scanner new Scanner(System.in) while (true) {
			int a = scanner.nextInt();
			int b = scanner.nextInt();
			if (a == 0 & b == 0)
				break;
			for (int i = 0; i < a; i++) {
				for (int j = 0; j < b; j++) {
					if(i==0||i == a-1)
						System.out.print("#");
					else if(j==0||j==b-1)
						System.out.print("#");
					else
						System.out.print(".");
				}
				System.out.println();
			}
			System.out.println();
		} true {
			int a = scanner.nextInt();
			int b = scanner.nextInt();
			if (a == 0 & b == 0)
				break;
			for (int i = 0; i < a; i++) {
				for (int j = 0; j < b; j++) {
					if(i==0||i == a-1)
						System.out.print("#");
					else if(j==0||j==b-1)
						System.out.print("#");
					else
						System.out.print(".");
				}
				System.out.println();
			}
			System.out.println();
		} int a = scanner.nextInt(); a scanner.nextInt() scanner.nextInt scanner int b = scanner.nextInt(); b scanner.nextInt() scanner.nextInt scanner if (a == 0 & b == 0)
				break; a == 0 & b == 0 a == 0 a 0 b == 0 b 0 break; for (int i = 0; i < a; i++) {
				for (int j = 0; j < b; j++) {
					if(i==0||i == a-1)
						System.out.print("#");
					else if(j==0||j==b-1)
						System.out.print("#");
					else
						System.out.print(".");
				}
				System.out.println();
			} int i = 0; int i = 0; i 0 i < a i a i++ i++ i {
				for (int j = 0; j < b; j++) {
					if(i==0||i == a-1)
						System.out.print("#");
					else if(j==0||j==b-1)
						System.out.print("#");
					else
						System.out.print(".");
				}
				System.out.println();
			} {
				for (int j = 0; j < b; j++) {
					if(i==0||i == a-1)
						System.out.print("#");
					else if(j==0||j==b-1)
						System.out.print("#");
					else
						System.out.print(".");
				}
				System.out.println();
			} for (int j = 0; j < b; j++) {
					if(i==0||i == a-1)
						System.out.print("#");
					else if(j==0||j==b-1)
						System.out.print("#");
					else
						System.out.print(".");
				} int j = 0; int j = 0; j 0 j < b j b j++ j++ j {
					if(i==0||i == a-1)
						System.out.print("#");
					else if(j==0||j==b-1)
						System.out.print("#");
					else
						System.out.print(".");
				} {
					if(i==0||i == a-1)
						System.out.print("#");
					else if(j==0||j==b-1)
						System.out.print("#");
					else
						System.out.print(".");
				} if(i==0||i == a-1)
						System.out.print("#");
					else if(j==0||j==b-1)
						System.out.print("#");
					else
						System.out.print("."); i==0||i == a-1 i==0 i 0 i == a-1 i a-1 a 1 System.out.print("#") System.out.print System.out System System.out "#" if(j==0||j==b-1)
						System.out.print("#");
					else
						System.out.print("."); j==0||j==b-1 j==0 j 0 j==b-1 j b-1 b 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.println() System.out.println System.out System System.out System.out.println() System.out.println System.out System System.out String[] args args public class Main {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		while (true) {
			int a = scanner.nextInt();
			int b = scanner.nextInt();
			if (a == 0 & b == 0)
				break;
			for (int i = 0; i < a; i++) {
				for (int j = 0; j < b; j++) {
					if(i==0||i == a-1)
						System.out.print("#");
					else if(j==0||j==b-1)
						System.out.print("#");
					else
						System.out.print(".");
				}
				System.out.println();
			}
			System.out.println();
		}
	}
} public class Main {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		while (true) {
			int a = scanner.nextInt();
			int b = scanner.nextInt();
			if (a == 0 & b == 0)
				break;
			for (int i = 0; i < a; i++) {
				for (int j = 0; j < b; j++) {
					if(i==0||i == a-1)
						System.out.print("#");
					else if(j==0||j==b-1)
						System.out.print("#");
					else
						System.out.print(".");
				}
				System.out.println();
			}
			System.out.println();
		}
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		while (true) {
			int a = scanner.nextInt();
			int b = scanner.nextInt();
			if (a == 0 & b == 0)
				break;
			for (int i = 0; i < a; i++) {
				for (int j = 0; j < b; j++) {
					if(i==0||i == a-1)
						System.out.print("#");
					else if(j==0||j==b-1)
						System.out.print("#");
					else
						System.out.print(".");
				}
				System.out.println();
			}
			System.out.println();
		}
	}
}