import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
	Scanner scan = new Scanner(System.in);
		int H,W;
		do{
			H = scan.nextInt();
			W = scan.nextInt();
			if(H == 0 && W == 0){break;} // H = 0 W = 0 ??§??????
			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.print("\n");
			}
			System.out.print("\n");	
		}while(true);
	}
} 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;
		do{
			H = scan.nextInt();
			W = scan.nextInt();
			if(H == 0 && W == 0){break;} // H = 0 W = 0 ??§??????
			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.print("\n");
			}
			System.out.print("\n");	
		}while(true);
	}
} Main public static void main(String[] args) {
	Scanner scan = new Scanner(System.in);
		int H,W;
		do{
			H = scan.nextInt();
			W = scan.nextInt();
			if(H == 0 && W == 0){break;} // H = 0 W = 0 ??§??????
			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.print("\n");
			}
			System.out.print("\n");	
		}while(true);
	} main {
	Scanner scan = new Scanner(System.in);
		int H,W;
		do{
			H = scan.nextInt();
			W = scan.nextInt();
			if(H == 0 && W == 0){break;} // H = 0 W = 0 ??§??????
			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.print("\n");
			}
			System.out.print("\n");	
		}while(true);
	} Scanner scan = new Scanner(System.in); scan new Scanner(System.in) int H H W; W do{
			H = scan.nextInt();
			W = scan.nextInt();
			if(H == 0 && W == 0){break;} // H = 0 W = 0 ??§??????
			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.print("\n");
			}
			System.out.print("\n");	
		}while(true); true {
			H = scan.nextInt();
			W = scan.nextInt();
			if(H == 0 && W == 0){break;} // H = 0 W = 0 ??§??????
			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.print("\n");
			}
			System.out.print("\n");	
		} H = scan.nextInt() H scan.nextInt() scan.nextInt scan W = scan.nextInt() W scan.nextInt() scan.nextInt scan if(H == 0 && W == 0){break;} // H = 0 W = 0 ??§?????? H == 0 && W == 0 H == 0 H 0 W == 0 W 0 {break;} 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.print("\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 || i == H - 1|| j == 0 || j == W - 1){
					System.out.print("#");
					}
					else{
					System.out.print(".");
					}
				}
					System.out.print("\n");
			} {
				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.print("\n");
			} 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.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 scan = new Scanner(System.in);
		int H,W;
		do{
			H = scan.nextInt();
			W = scan.nextInt();
			if(H == 0 && W == 0){break;} // H = 0 W = 0 ??§??????
			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.print("\n");
			}
			System.out.print("\n");	
		}while(true);
	}
} public class Main {
    public static void main(String[] args) {
	Scanner scan = new Scanner(System.in);
		int H,W;
		do{
			H = scan.nextInt();
			W = scan.nextInt();
			if(H == 0 && W == 0){break;} // H = 0 W = 0 ??§??????
			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.print("\n");
			}
			System.out.print("\n");	
		}while(true);
	}
} Main
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
	Scanner scan = new Scanner(System.in);
		int H,W;
		do{
			H = scan.nextInt();
			W = scan.nextInt();
			if(H == 0 && W == 0){break;} // H = 0 W = 0 ??§??????
			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.print("\n");
			}
			System.out.print("\n");	
		}while(true);
	}
}