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:
['2787', '6085', '6989']

Ex Output:
15861


Ex Input:
['t', 'v', 'B', 'Y']

Ex Output:
0


Ex Input:
['s', '4633', 'V', '7531', 'P', '8891', '9457', 'o', '217', '475', 'c', '2689', 'g', '8803', '333', 'D']

Ex Output:

43029