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:
['E', 'X', 'C', 'v', '2803', 'g', 'b', '763']

Ex Output:
3566


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

Ex Output:
50667


Ex Input:
['439', 'O', 'P']

Ex Output:

439