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:
['6051', '5303', '1509', '2797', 'Z', '4777', '721', '8563', 'K', '63', '9115', 'd', '7305', '9743', '7409']

Ex Output:
63356

Ex Input:
['9989', 'B', 'E', '5181']

Ex Output:
15170

Ex Input:
['y', 'Y', 'B', '3817', 'Y', '3441']

Ex Output:
7258