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:
['3319', 'e', 'c', 'G', '2399', '1557', '4813', 'z', 'U', '4895', 's', '1193', 'A', 'G']

Ex Output:
18176


Ex Input:
['r', '6537', '3001', '7879']

Ex Output:
17417


Ex Input:
['y', '1689', 'j', 'o']

Ex Output:

1689