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:
['3121', 'j']

Ex Output:
3121


Ex Input:
['B', 'u', '9227', 'b', '8767']

Ex Output:
17994


Ex Input:
['3253', 'Y', 'A', 's', 'N', '3867', 'K', '9361', 'F', '5671', 'k', '7631', '9939']

Ex Output:

39722