import java.util.Scanner;

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