import java.util.*;
class Main{
	Scanner sc=new Scanner(System.in);
	void aa(){
		while(true){
			int h=sc.nextInt();
			int w=sc.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();
		}
	}
	public static void main(String[]arg){
		new Main().aa();
	}
} import java.util.*; util.* java class Main{
	Scanner sc=new Scanner(System.in);
	void aa(){
		while(true){
			int h=sc.nextInt();
			int w=sc.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();
		}
	}
	public static void main(String[]arg){
		new Main().aa();
	}
} Main Scanner sc=new Scanner(System.in); sc new Scanner(System.in) void aa(){
		while(true){
			int h=sc.nextInt();
			int w=sc.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();
		}
	} aa {
		while(true){
			int h=sc.nextInt();
			int w=sc.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();
		}
	} while(true){
			int h=sc.nextInt();
			int w=sc.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=sc.nextInt();
			int w=sc.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=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=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 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 public static void main(String[]arg){
		new Main().aa();
	} main {
		new Main().aa();
	} new Main().aa() new Main().aa new Main() String[]arg arg
import java.util.*;
class Main{
	Scanner sc=new Scanner(System.in);
	void aa(){
		while(true){
			int h=sc.nextInt();
			int w=sc.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();
		}
	}
	public static void main(String[]arg){
		new Main().aa();
	}
}