#!/usr/bin/python

input=open('DATA1.txt','r')
output=open('OUT1.txt','w')
instring=input.read()
question=instring.split()

for i in question:
	count=1
	down=False
	for j in range(int(i)):
		for k in range((int(i)-count)/2):
			output.write('.'),
		for k in range(count):
			output.write('#'),
		for k in range((int(i)-count)/2):
			output.write('.'),
		if count==int(i):
			down=True
		if count<int(i) and down==False:
			count=count+2
		else:
			count=count-2
		output.write('\n')
output.close()