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]: ['K', '4403', 'a', '3881', '4139', 'w', '1861', 'G']
[A]: 14284


[Q]: ['6921', 'a', 'U', '2821', '2111', 'h', '3937', '3697', 'd', '6309', 'q', '7961', '5287', '5375', '2721', '4523', 'V', '8633', 'c', '7643']
[A]: 67939


[Q]: ['Y', 'p', 'O', '1633', '2833', '5033', 'Q', 'b', '2433', '9169', '5263', 'V', '9077', 'Y']
[A]:
35441