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

Ex Output:
50667


Ex Input:
['211', '7561', '8725', '6139', 'I', '6585', '4231', 't', '2983', 'T', 'S', '9569', 'R', 'b', 'N', 'X', '9009']

Ex Output:
55013


Ex Input:
['i', 'w', 'b', '3929', '5813', '3667', 'D', 'V']

Ex Output:

13409