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:
['q', '867', 'e', 'z']

Ex Output:
867


Ex Input:
['7593', 'H', '4811', 'T', 'A', 'x', '6029', 'E', 'M', 'x']

Ex Output:

18433