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:
['v', 't', 'a', 'r', 'O', 'I']

Ex Output:
0


Ex Input:
['b', 'W', 'V', 'R', '3761', 'U', '4553', '1803', 'W', '7775', '1067', 'Y', 'D', '3159']

Ex Output:
22118


Ex Input:
['9623', '2483', 'U', 'g', 'j', '351', 'e', 'J', 'X', 'T', '671', '6217', '7557', '7435']

Ex Output:

34337