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

Ex Output:
57922


Ex Input:
['j', 'f', '3831', 'B', 'D']

Ex Output:
3831


Ex Input:
['6461', 'g', 't', 'p', 'I', 'K', '1223', '7579']

Ex Output:

15263