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:
['57', '9977', '2657', 'p', '9573', '7745', '4755', 'U']

Ex Output:
34764


Ex Input:
['A', '9775', '5867', 'n', '1329', '5973']

Ex Output:
22944


Ex Input:
['S', 'I']

Ex Output:

0