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:
['D', '9679', 'e', '5537', 'G', 'l', '2653', 'a', 'Y', '8467', 'q', 'L', '7239', 'O']

Ex Output:
33575


Ex Input:
['7763', '6003', 'V']

Ex Output:
13766


Ex Input:
['w', '4783', '9843', '7895', 'k', 'y', 'N', 'f', 'V', '5431', '7153', 'j']

Ex Output:

35105