import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		while (true) {
			String[] inputNum = br.readLine().split(" ");
			int H = Integer.parseInt(inputNum[0]);
			int W = Integer.parseInt(inputNum[1]);

			if (H == 0 && W == 0) {
				break;
			}

			for (int i = 1; i <= H; i++) {
				for (int j = 1; j <= W; j++) {
					if (i == 1 || i == H || j == 1 || j == W) {
						System.out.print("#");
					}else {
						System.out.print(".");
					}
				}
				System.out.println("");

			}
			System.out.println("");

		}

	}

} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io public class Main {

	public static void main(String[] args) throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		while (true) {
			String[] inputNum = br.readLine().split(" ");
			int H = Integer.parseInt(inputNum[0]);
			int W = Integer.parseInt(inputNum[1]);

			if (H == 0 && W == 0) {
				break;
			}

			for (int i = 1; i <= H; i++) {
				for (int j = 1; j <= W; j++) {
					if (i == 1 || i == H || j == 1 || j == W) {
						System.out.print("#");
					}else {
						System.out.print(".");
					}
				}
				System.out.println("");

			}
			System.out.println("");

		}

	}

} Main public static void main(String[] args) throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		while (true) {
			String[] inputNum = br.readLine().split(" ");
			int H = Integer.parseInt(inputNum[0]);
			int W = Integer.parseInt(inputNum[1]);

			if (H == 0 && W == 0) {
				break;
			}

			for (int i = 1; i <= H; i++) {
				for (int j = 1; j <= W; j++) {
					if (i == 1 || i == H || j == 1 || j == W) {
						System.out.print("#");
					}else {
						System.out.print(".");
					}
				}
				System.out.println("");

			}
			System.out.println("");

		}

	} main {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		while (true) {
			String[] inputNum = br.readLine().split(" ");
			int H = Integer.parseInt(inputNum[0]);
			int W = Integer.parseInt(inputNum[1]);

			if (H == 0 && W == 0) {
				break;
			}

			for (int i = 1; i <= H; i++) {
				for (int j = 1; j <= W; j++) {
					if (i == 1 || i == H || j == 1 || j == W) {
						System.out.print("#");
					}else {
						System.out.print(".");
					}
				}
				System.out.println("");

			}
			System.out.println("");

		}

	} BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) while (true) {
			String[] inputNum = br.readLine().split(" ");
			int H = Integer.parseInt(inputNum[0]);
			int W = Integer.parseInt(inputNum[1]);

			if (H == 0 && W == 0) {
				break;
			}

			for (int i = 1; i <= H; i++) {
				for (int j = 1; j <= W; j++) {
					if (i == 1 || i == H || j == 1 || j == W) {
						System.out.print("#");
					}else {
						System.out.print(".");
					}
				}
				System.out.println("");

			}
			System.out.println("");

		} true {
			String[] inputNum = br.readLine().split(" ");
			int H = Integer.parseInt(inputNum[0]);
			int W = Integer.parseInt(inputNum[1]);

			if (H == 0 && W == 0) {
				break;
			}

			for (int i = 1; i <= H; i++) {
				for (int j = 1; j <= W; j++) {
					if (i == 1 || i == H || j == 1 || j == W) {
						System.out.print("#");
					}else {
						System.out.print(".");
					}
				}
				System.out.println("");

			}
			System.out.println("");

		} String[] inputNum = br.readLine().split(" "); inputNum br.readLine().split(" ") br.readLine().split br.readLine() br.readLine br " " int H = Integer.parseInt(inputNum[0]); H Integer.parseInt(inputNum[0]) Integer.parseInt Integer inputNum[0] inputNum 0 int W = Integer.parseInt(inputNum[1]); W Integer.parseInt(inputNum[1]) Integer.parseInt Integer inputNum[1] inputNum 1 if (H == 0 && W == 0) {
				break;
			} H == 0 && W == 0 H == 0 H 0 W == 0 W 0 {
				break;
			} break; for (int i = 1; i <= H; i++) {
				for (int j = 1; j <= W; j++) {
					if (i == 1 || i == H || j == 1 || j == W) {
						System.out.print("#");
					}else {
						System.out.print(".");
					}
				}
				System.out.println("");

			} int i = 1; int i = 1; i 1 i <= H i H i++ i++ i {
				for (int j = 1; j <= W; j++) {
					if (i == 1 || i == H || j == 1 || j == W) {
						System.out.print("#");
					}else {
						System.out.print(".");
					}
				}
				System.out.println("");

			} {
				for (int j = 1; j <= W; j++) {
					if (i == 1 || i == H || j == 1 || j == W) {
						System.out.print("#");
					}else {
						System.out.print(".");
					}
				}
				System.out.println("");

			} for (int j = 1; j <= W; j++) {
					if (i == 1 || i == H || j == 1 || j == W) {
						System.out.print("#");
					}else {
						System.out.print(".");
					}
				} int j = 1; int j = 1; j 1 j <= W j W j++ j++ j {
					if (i == 1 || i == H || j == 1 || j == W) {
						System.out.print("#");
					}else {
						System.out.print(".");
					}
				} {
					if (i == 1 || i == H || j == 1 || j == W) {
						System.out.print("#");
					}else {
						System.out.print(".");
					}
				} if (i == 1 || i == H || j == 1 || j == W) {
						System.out.print("#");
					}else {
						System.out.print(".");
					} i == 1 || i == H || j == 1 || j == W j == 1 i == 1 || i == H || j == 1 || j == W i == 1 i 1 i == H i H j == 1 j 1 j == W j W {
						System.out.print("#");
					} System.out.print("#") System.out.print System.out System System.out "#" {
						System.out.print(".");
					} 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) throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		while (true) {
			String[] inputNum = br.readLine().split(" ");
			int H = Integer.parseInt(inputNum[0]);
			int W = Integer.parseInt(inputNum[1]);

			if (H == 0 && W == 0) {
				break;
			}

			for (int i = 1; i <= H; i++) {
				for (int j = 1; j <= W; j++) {
					if (i == 1 || i == H || j == 1 || j == W) {
						System.out.print("#");
					}else {
						System.out.print(".");
					}
				}
				System.out.println("");

			}
			System.out.println("");

		}

	}

} public class Main {

	public static void main(String[] args) throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		while (true) {
			String[] inputNum = br.readLine().split(" ");
			int H = Integer.parseInt(inputNum[0]);
			int W = Integer.parseInt(inputNum[1]);

			if (H == 0 && W == 0) {
				break;
			}

			for (int i = 1; i <= H; i++) {
				for (int j = 1; j <= W; j++) {
					if (i == 1 || i == H || j == 1 || j == W) {
						System.out.print("#");
					}else {
						System.out.print(".");
					}
				}
				System.out.println("");

			}
			System.out.println("");

		}

	}

} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		while (true) {
			String[] inputNum = br.readLine().split(" ");
			int H = Integer.parseInt(inputNum[0]);
			int W = Integer.parseInt(inputNum[1]);

			if (H == 0 && W == 0) {
				break;
			}

			for (int i = 1; i <= H; i++) {
				for (int j = 1; j <= W; j++) {
					if (i == 1 || i == H || j == 1 || j == W) {
						System.out.print("#");
					}else {
						System.out.print(".");
					}
				}
				System.out.println("");

			}
			System.out.println("");

		}

	}

}