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:
['9403', '2607', 'G', '7901', 'K', '7967', 'a', 'n', '1967', 'x', 'g', '1081']

Ex Output:
30926


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

Ex Output:
41902


Ex Input:
['1671', '8965', '3581', 'A', '365', '999', 'l', 'y', 's', '9289', '2685', '543', '1585', '2195', '1167', '5877', 'N', 'f']

Ex Output:

38922