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:
['3557', '3345', '307', '9791', '1897', 'O']

Ex Output:
18897


Ex Input:
['6255', '8457', 'V', 'z', '4405', 'X', '9267', '5329', 'I']

Ex Output:
33713


Ex Input:
['T', '7887', 'i', '875', 'W', 'S', '6213', '8755', '2351']

Ex Output:

26081