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:
['2923', '3573', '6179', '7673', '6551', 'B', '315', '5169', 'm', '9405', 'm', 'Z']

Ex Output:
41788


Ex Input:
['S', 'D', '3101', '4967', '8197', '5025', '4257', 'S', 'X', '7641', 'n', '6775', '4719', 'o', '2821', 'x', '5605', '2181']

Ex Output:
55289


Ex Input:
['2331', '9467', '8513', 's', 'A', '2773', 'z', '153', '2723', 'r']

Ex Output:

25960