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:
['D', 'P', '9951', '2897', 'V', 'C', 'B', 'H', 'c', 'h', '2843', 'a']

Ex Output:
15691


Ex Input:
['2895', '8095', 'y', '1927', '4827']

Ex Output:
17744


Ex Input:
['X', 'y', '5149', '6543', '5387', 'w', 'o', 'C', 'k']

Ex Output:

17079