In this task, you are given an input list A. You need to find all the elements of the list that are numbers and calculate their sum.

[Q]: ['9787', '1491', '4411', '5261', 'U', '9787', 'b']
[A]: 30737


[Q]: ['7379', 'I', '2031', '8419', 'w', 'b', '9827', 'X', 'Y', 't', '3789', 'B', 'c', '6599', 'F', '6169', 'V']
[A]: 44213


[Q]: ['3863', 'X', '2601', 'K']
[A]:
6464