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:
['3107', 'D', '9595', '8807', 'Q', 'o', 'T', 'N', 'A']

Ex Output:
21509


Ex Input:
['W', 'c', '7971', 'J', 'o']

Ex Output:
7971


Ex Input:
['9715', '1851', '2753', '4417', '8737', '8695', 'y', 'x', 'b', '3277', 'D']

Ex Output:

39445