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:
['8529', '2657', '1599', 'b', '8187', '7005', '7481']

Ex Output:
35458


Ex Input:
['N', 'O', '2635', '8891']

Ex Output:
11526


Ex Input:
['z', '6797', '2847']

Ex Output:

9644