class EmptyListException(Exception):
    pass


class InvalidPositionException(Exception):
    pass


class NoSuchElementException(Exception):
    pass


class EmptyStackException(Exception):
    pass


class FullStackException(Exception):
    pass


class EmptyQueueException(Exception):
    pass


class FullQueueException(Exception):
    pass


class DuplicatedKeyException(Exception):
    pass
