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:
['8109', '5635', 'u', 'M', '1009']

Ex Output:
14753


Ex Input:
['29', 'N', '5061', '7191', 'z', '8367']

Ex Output:
20648


Ex Input:
['C', 'a']

Ex Output:

0