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:
['e', 'K', 'A', 'V', '1169', 'n', '8729', 'V']

Ex Output:
9898


Ex Input:
['3809', '9401', '63', '5705', 'u', '6275', 'k', 'l', '1171', '9365', 'L', 'O', '7431', '8567', 'h', '6135']

Ex Output:
57922


Ex Input:
['7227', 'n', '2589', '9715', '2377']

Ex Output:

21908