'''
Design the data structures for an online book reader system.

Hints: 344
'''


def onlinebookreader(s):
    pass

if __name__ == '__main__':
    assert onlinebookreader('') ==
    assert onlinebookreader('') ==
    assert onlinebookreader('') ==
    assert onlinebookreader('') ==
    assert onlinebookreader('') ==
