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:
['2097', '7815', 'f', '1705', '7553', 'C', 'n', '7091', '1253', 'z', '9229', 'H', 'N', '6481', 'H', 'M', 'G', '4527', '8537']

Ex Output:
56288


Ex Input:
['A', 'y', 'u', 'S']

Ex Output:
0


Ex Input:
['3461', 'P', 'T', '2377', '9685', '7921', 'j', 'G', 'B', 'J', 'U', '1425', 'J', 'n', 'N', 'e']

Ex Output:

24869