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:
['1875', '9833', 'i', '7493', 'J', 'P', 'z']

Ex Output:
19201


Ex Input:
['2417', '6671']

Ex Output:
9088


Ex Input:
['9933', 'E', '7475', 'X', 'Q', '4129']

Ex Output:

21537