def METHOD_NAME(self, x):
    """
    INPUT:
    - ``x`` -- an element of the ambient space for ``self``
    Retracts ``x`` from the ambient space to ``self``, as per
    :meth:`Sets.Subquotients.ParentMethods.retract()
    <sage.categories.sets_cat.Sets.Subquotients.ParentMethods.retract>`.
    EXAMPLES::
        sage: C = FiniteEnumeratedSets().IsomorphicObjects().example(); C
        The image by some isomorphism of An example of a finite enumerated set: {1,2,3}
        sage: C.retract(3)
        9
    """
    return x ** 2