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:
['x', '1305', 'b', '8193']

Ex Output:
9498


Ex Input:
['k', 'a']

Ex Output:
0


Ex Input:
['9345', 'd', 's', '3429', '9285', 'v', '6493', '785']

Ex Output:

29337