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:
['Y', '8169', '9067']

Ex Output:
17236


Ex Input:
['K', '9121', 'y', '4233', '1513', 'd', '5609', 'C', 'q', 'p', 'S', '627', 'q', 'I']

Ex Output:
21103


Ex Input:
['8037', 'S', 'l', '7205', '5563', '4795', 'n', '8237']

Ex Output:

33837