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:
['4811', 'Q', '2289', 'N', 'I', '7681', 'z', '8179', '3359', '5299', 'R', 'z', '8697', '5781', '4803', '2715', '6511', '1371']

Ex Output:
61496


Ex Input:
['X', 'P', 'x', '9471', '5', 'c', 'f', '5077', '1085', '2267', 'R', 'q', '4987', '9529', 'H', 'n', 'r', 'u']

Ex Output:
32421


Ex Input:
['597', '8281', '5763', 'C', '6609', '7625', 'a', '8361', '3841']

Ex Output:

41077