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:
['c', '4501', 'O']

Ex Output:
4501


Ex Input:
['7959', '1345', '4605', '6453', 'Q']

Ex Output:
20362


Ex Input:
['Q', '9169']

Ex Output:

9169