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:
['b', 'i', '7807', 'g', '1611', '6733', 'V', '561', 'C', '8575', 's', 'E', '8129', 'F']

Ex Output:
33416


Ex Input:
['2417', '6671']

Ex Output:
9088


Ex Input:
['n', 'B', 'B', '4445', 'y', 'p', '1873', 'w', 'm', '1155', 'W', 'q', '7811']

Ex Output:

15284