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:
['2895', '8095', 'y', '1927', '4827']

Ex Output:
17744


Ex Input:
['y', 'F', '135', '7359', '8579', '6809', '3979', 'H', 'm', '5059', '373', 'Y']

Ex Output:
32293


Ex Input:
['7767', 'f', 'h', 'z']

Ex Output:

7767