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:
['v', 'Y', '4135', '8645', '263', '5377', '8677', 'Z', 'W', 'g', 'n', 'r', 's', '8513', '5677', 'u', '3033', 'I']

Ex Output:
44320


Ex Input:
['h', '2335', '2669', '6035', '9901', '7721', 's', '6181', 'C', 'l', 'x', '8275', '1103', 'S', '6447']

Ex Output:
50667


Ex Input:
['2155', 'P', 'p', '1553', '4703', '9819', 'g', '5769', '3379', 'X', '5091', 'G', 'x', '4827', 'Z']

Ex Output:

37296