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:
['9403', 'u', '4159', 'w', '3467']

Ex Output:
17029


Ex Input:
['m', 'e', 'W', 'N', '4459', '693', '3765', '2641']

Ex Output:

11558