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:
['3575', '8877', '3231', 'v', '9083', '317', 'M', '8975', 'x', 'F']

Ex Output:
34058


Ex Input:
['D', 'K', 'n', 'd', 'i', 'U']

Ex Output:
0


Ex Input:
['4335', '6697', 'z', 'U', '6039', '7681', '4407', '4057', 'I', 'f', 'P', '6147', '5805']

Ex Output:

45168