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:
['7459', '491', '7823', '6965', 'H', '109', 'R', 't', '3959', '2821', 'R', '2807', 'o', 'v', '1305', 'a', '1411', 'r', '3669']

Ex Output:
38819


Ex Input:
['E', 'X', 'C', 'v', '2803', 'g', 'b', '763']

Ex Output:
3566


Ex Input:
['b', '3697', 'Z', 'B', 'a', 'F', 'y', '3245', 'C', 'd', 'Q', 'J', '5121', 'M', 'M', '5995']

Ex Output:

18058