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.

Ex Input:
['v', 'a', 'O', 'S', 'r', 'T', 'r', 'K', 'K', '7781', '1749']

Ex Output:
9530


Ex Input:
['g', 'h', '9141', '7825', 'a', 'u', '2389', 'r', '9739', '8337', 'Z', 'Z', '6717']

Ex Output:
44148


Ex Input:
['2523', 'y', '2871', 'P', '2261', 'D', '4933', 'k', '6381', 'V']

Ex Output:

18969