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:
['7187', '5651', 'd', '4869', 'q', '2375', '3547']

Ex Output:
23629


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

Ex Output:
21103


Ex Input:
['1425', '8413', 'N']

Ex Output:

9838