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]: ['6629', 'o', 'e', '497', '4865', '8733', '5733', '7337', 'N']
[A]: 33794


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


[Q]: ['8613', 'm', 'Q', 'Y', 'W', 'r', '221', '5795', 'U', 'G', '4651', 'F', '2267', 'P', '6377', '3865', 'u']
[A]:
31789