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:
['P', '6299', '9655', 'l', '6317', '2139', '3347', 'l', '3095', '7363', '3115', '7529', 'R']

Ex Output:
48859


Ex Input:
['9905', 'm', 'Q', 'S', 'T', '7821', '1773', '9515', '3963', '2931', '7023', '8677', '1739', 'O', '909', '9153', '8319', 'k', '2851']

Ex Output:
74579


Ex Input:
['k', 'w', 'L', '4519', '3507', 'J', 'v', '3353', '4031', '7941', '8459', '4339', 'B', '9427', '1751', '599', '1165']

Ex Output:

49091