/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		Scanner sc = new Scanner(System.in);
		int h,w;
		while(true){
			h = sc.nextInt();
			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();
		}
	}
} import java.util.*; util.* java import java.lang.*; lang.* java import java.io.*; io.* java class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		Scanner sc = new Scanner(System.in);
		int h,w;
		while(true){
			h = sc.nextInt();
			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();
		}
	}
} Main public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		Scanner sc = new Scanner(System.in);
		int h,w;
		while(true){
			h = sc.nextInt();
			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();
		}
	} main {
		// your code goes here
		Scanner sc = new Scanner(System.in);
		int h,w;
		while(true){
			h = sc.nextInt();
			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();
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int h h w; w while(true){
			h = sc.nextInt();
			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 {
			h = sc.nextInt();
			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();
		} h = sc.nextInt() h sc.nextInt() sc.nextInt sc 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 String[] args args
/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		Scanner sc = new Scanner(System.in);
		int h,w;
		while(true){
			h = sc.nextInt();
			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();
		}
	}
}