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:
['2729', 'W', 'i', '9073', '343', 'j', '2329', '9159', '4825']

Ex Output:
28458


Ex Input:
['Q', '6383', 'P', '8455', '3881', '5821', 'e', 'v', '1421', 'Q', '6377', '3157', '6407', 'q']

Ex Output:
41902


Ex Input:
['1507', '5153']

Ex Output:

6660