#!/usr/bin/env python

from math import sin,cos,radians

radius = 17
steps = 90 
angle_increment = 90/steps 
grid = []

for n in range(0,(90/angle_increment) + 1):
	angle = n * angle_increment
	x = int(sin(radians(angle)) * radius)
	y = int(cos(radians(angle)) * radius)
	if (x,y) not in grid:
		grid.append((x,y))

rows = []
for row in range(radius,-1,-1): 
	thisrow = ""
	# top half
	for col in range(0,radius+1):
		if(col,row) in grid:
			thisrow += "O"	
		else:
			thisrow += "."
	# mirror thisrow and prefix it to thisrow (add top left quadrant)
	thisrow = thisrow[1:radius+1][::-1] + thisrow
	rows.append(thisrow)

#print top hemisphere
for row in rows:
	print row 

#print bottom hemisphere (reverse it -> chop first element off)
for row in rows[::-1][1:radius+1]:
	print row