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:
['7277', 'c', '9587', '2613', '853', 'w', 'y', '4067', 'o', 'u', 'j', 'W', '1517', 'x', 'Y']

Ex Output:
25914


Ex Input:
['R', 'C', 'S', 'x', '1529', 'r']

Ex Output:
1529


Ex Input:
['9029', 'G', 'g', '4021', 'M', '9409', 'x', 'V', 'r', 'k', '8213', '6001', 'z']

Ex Output:

36673