#!/usr/bin/env python3
from random import randint
teststring = "ala ma kota"

b = bytearray()

r = teststring.encode()

while True:
	b += r[:randint(0, len(teststring))]
	b += r[:randint(0, len(teststring))]
	b += r[:randint(0, len(teststring))]
	b += r[:randint(0, len(teststring))]

	if len(b) >= len(teststring):
		del b[:len(teststring)]