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:
['9903', 'H', '757', 'J', '6481', '9789', 'H', '3285', 'V', 'X', '5229', '7197']

Ex Output:
42641


Ex Input:
['u', 'i', 'z', 't', '9617', 'd', '3255', 'w', 'S', '3041', '7451']

Ex Output:
23364


Ex Input:
['c', '2051', 'I', 'f', 'Y', '4293', 'S']

Ex Output:

6344