import sys
from time import sleep

if __name__ == "__main__":
	i = 0
	x = 0
	d = 1
	print('\033[36m')

	while 1:
		sys.stdout.write(chr(8) * 80)
		for j in range(0, 80):
			sys.stdout.write('█' if j % 8 == i else " ")
		sys.stdout.flush()
		i += d
		if i >= 8:
			i = 0
		elif i < 0:
			i = 7
		sleep(1 / 30)
		x += 1
		if x >= 10:
			x = 0
			d = -1 * d