x_range = 20
y_range = 20

def pow(a, b):
	if b == 0: return 1
	elif b == 1: return a
	elif b%2 == 1: return a*pow(a, b-1)
	else:
		c = pow(a, b/2)
		return c*c

def tet(a, b):
	if a <= 0: return 0
	elif a == 1: return b
	else: return tet(a-1, pow(b, b))

def t(n):
	divs = 1
	for d in range(2, n+1):
		if n%d == 0: divs += 1
	return divs

def s(n):
	divs = 1
	for d in range(2, n+1):
		if n%d == 0: divs += d
	return divs

def graph():
	# x_range = int(raw_input("Enter range for x: "))
	# y_range = int(raw_input("Enter range for y: "))
	condition = raw_input("Enter a condition: ")
	
	with file('out.txt', 'w') as output:
		for y in range(1, y_range+1):
			line = ""
			for x in range(1, x_range+1):
				if (eval(condition)): line += 'x '
				else: line += '  '
			print line
			output.write(line+"\n")

while (True):
	try: graph()
	except: break