/* 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 Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		int N = 5;
		
		for(int i = 0 ; i < N ; i++){
			for(int j = 0 ; j < N ; j++){
				if(i == 0 || i == N-1 || j == 0 || j == N-1) {
					if (i == 1 && j == 0) {
						System.out.print(".");
					}else {
						System.out.print("#");
					}
				}else {
					System.out.print(".");
				}
			}
			System.out.println("");
		}
	}
}