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:
['s', 'd', 't', '8235', '2279', '7477', '3029', '4377', '9153', '4309', '2295', '407']

Ex Output:
41561


Ex Input:
['E', 'y']

Ex Output:
0


Ex Input:
['3201', 'q', '6051', '7485']

Ex Output:

16737