Question: Write a predicate in Prolog cleanListDCG/3 which parses a list and returns a new list with the same numbers but all elements that are not

Write a predicate in Prolog cleanListDCG/3 which parses a list and returns a new list with the same numbers but all elements that are not a number removed. You must use only DCG notation. Your implementation of cleanListDCG/3 must work correctly when called from cleanList/2.

cleanList(L,LL) :- cleanListDCG(LL,L,[]),!.

Example: ?- cleanList([1,2,d,67,3.2,'CSI2120',foo,5],LL).

LL = [1, 2, 67, 3.2, 5].

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