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:
['z', '3199', 'r', '849', 'C', 'v', '1931', 'M', 'Q', '4531', '579', 'x', '8997', '4663']

Ex Output:
24749


Ex Input:
['4949', '2459', 'n', 'f', 'n', 'v', '8421', '1519', '4859', 'c', '9923', '2829', 'K', '4937', 'W', 'R']

Ex Output:
39896


Ex Input:
['6189', 'J', '7973', '9331', 'e', 'K', '9843', 'q', 'A', '4987', '5309', '7033', '4341', 'l', '3797', 'V', 'B', 'P', 'S']

Ex Output:

58803