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]: ['w', '8035', 'J', '2671', '7509', '1573', '6915', '8569', '345', 'T', 'P', 's', '1341', '7823', '8671', 'm', 'Q', 's', 'N']
[A]: 53452


[Q]: ['8211', 'g', 'Z', '8245', 'f', 'Y', '2145']
[A]:
18601