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:
['6051', '5303', '1509', '2797', 'Z', '4777', '721', '8563', 'K', '63', '9115', 'd', '7305', '9743', '7409']

Ex Output:
63356


Ex Input:
['8821', '7221']

Ex Output:
16042


Ex Input:
['2709', '2663', '8911', 'B', '5407', '1051', 'a', 'n', 'R', 'O', 'O', 'F', 'o', '2515', '1961']

Ex Output:

25217