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:
['T', 'n', '8513', '5565', '6343', '1403', '975', '6959', '8049', '1601', 'j', 'Q', 'O', '7889', 'r', 'D', '1903', '6607']

Ex Output:
55807


Ex Input:
['2087', '8171', 'c', 'd', 'a', '5621', 'n']

Ex Output:
15879


Ex Input:
['j', '9393', '7693', '1639', 'C']

Ex Output:

18725