import java.util.*;

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

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