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

Ex Output:
21103


Ex Input:
['u', 'W', '1561', '9243', '4923', '9385']

Ex Output:
25112


Ex Input:
['p', 'q', 'r', 'S']

Ex Output:

0