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:
['9903', 'H', '757', 'J', '6481', '9789', 'H', '3285', 'V', 'X', '5229', '7197']

Ex Output:
42641


Ex Input:
['C', 'v', '1353', 'e', 'x', 'A', 'D', '1243', '477', 'z', '3483', '5213', 'k', 'm', 'n']

Ex Output:
11769


Ex Input:
['K', 'l', 'M', '8791', 'r', 'm', 'W', '7299', '7521', 'q']

Ex Output:

23611