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:
['p', '4689']

Ex Output:
4689


Ex Input:
['y', 'p', '3553', '2155', 'b', 'R', 'j', 'V', 'U']

Ex Output:
5708


Ex Input:
['6585', '5263', '9497', '1117', 'a', 'F', 'w', '6595', '547']

Ex Output:

29604