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:
['X', '6189', '5435', 'y', '8931', '8987', 'F', '8377', 'k', '8631', '8717', 'q', '2923', 'g', '7225', 'j']

Ex Output:
65415


Ex Input:
['a', 'q', '4085', '6327', '6869', 'Z', 't', '7057', '1965', 'p', 'o']

Ex Output:
26303


Ex Input:
['s', 'D', 'Q', 'Z', '4761', '3073', 'G', 'a', 'c', '6723', '1331', 'K']

Ex Output:

15888