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:
['8755', 'A', '2893', '6703']

Ex Output:
18351


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

Ex Output:
41902


Ex Input:
['C', '3261', 'K', '5657', 'P', 'F', '8761', 'v', 'z']

Ex Output:

17679