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:
['Q', '6383', 'P', '8455', '3881', '5821', 'e', 'v', '1421', 'Q', '6377', '3157', '6407', 'q']

Ex Output:
41902


Ex Input:
['251', '2155', '5029', 'k', 'j', 'I']

Ex Output:
7435


Ex Input:
['U', 'j', 'J', 'd']

Ex Output:

0