def main():
# e0 = Element(0)
# e1 = Element(1)
# e2 = Element(2)
# e3 = Element(3)
rb = RingBuffer(4)
rb.append(0)
rb.append(1)
rb.append(2)
rb.append(3)
rb.append(4)
rb.append(5)
print(rb.delete())
print(rb.delete())
print(rb.get_data())
