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:
['2765', '6767', '7645']

Ex Output:
17177


Ex Input:
['135', 'a', 'X', '8067', '8447', '4009', '4221', 'o', 'A', 'x']

Ex Output:
24879


Ex Input:
['6713', '6335', 'E', 'l', '7495', '1005', '475', 'O', '8941', '8387', '3915', 'r', 'j', 'x', 'M', 'W', 'H', '5715']

Ex Output:

48981