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', 'p', '97', 'R', '2999', 'u', '7307', '6033', '6431', 'm', 'T']

Ex Output:
22867


Ex Input:
['D', '7807', '9395', 'T', 'c', '5139', '2827', 't', 'T', 'm', '3717', 'U', '3225', '7419', '2481', 'p', 'C', '5277']

Ex Output:
47287


Ex Input:
['8451', 'm', '8969', 'a', 'I', 'v', '4281']

Ex Output:

21701