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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 get_dialect(mixed: Union[SQLCompiler, Engine, Dialect]) -> Dialect: """ Finds the SQLAlchemy dialect in use. Args: mixed: an SQLAlchemy :class:`SQLCompiler`, :class:`Engine`, or :class:`Dialect` object Returns: the SQLAlchemy :class:`Dialect` being used """

    if isinstance(mixed, Dialect):
        return mixed
    elif isinstance(mixed, Engine):
        return mixed.dialect
    elif isinstance(mixed, SQLCompiler):
        return mixed.dialect
    else:
        raise ValueError("get_dialect: 'mixed' parameter of wrong type")