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:
['6921', 'a', 'U', '2821', '2111', 'h', '3937', '3697', 'd', '6309', 'q', '7961', '5287', '5375', '2721', '4523', 'V', '8633', 'c', '7643']

Ex Output:
67939


Ex Input:
['o', 'p', 't', '3789', '4933', 'G', 'X', 'h', 'I', '7899', 'g', 'K', '1567', 'd', '2957', 'n']

Ex Output:

21145