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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def deser(val):
 """ Deserialize from a string representation of an long integer to the python representation of a long integer. :param val: The string representation of the long integer. :return: The long integer. """

    if isinstance(val, str):
        _val = val.encode("utf-8")
    else:
        _val = val

    return base64_to_long(_val)