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:
['4177', 'd', 'b', 'm', 'f', 'R', '797', '7905', '4355', '7515', '9801', 'F', 'R', '9125', '8445', 'k', 'K', 'K']

Ex Output:
52120


Ex Input:
['5499', '39', 'Q', 'b', 'W', '7155', '2515']

Ex Output:
15208


Ex Input:
['P', '7709', 'E', '4737', 'J', '5819', '5231', '6291', 'T', 'm', '7725', '3161', 'o', 'x', 'D', 'H', 'l', '3717']

Ex Output:

44390