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:
['R', '3361', 'c', 'S', 'g', '3829', '7347', '6633', 'e', '9227']

Ex Output:
30397


Ex Input:
['W', '3629', '6053', '1035', '1717', 'n', 'y', '9585', 'D', '5125', 's', '9801', '2905', 'E', '5797', 'T']

Ex Output:
45647


Ex Input:
['3877', 'A', '2623', '6855', '7407', 'Y', '857', '625', 'w', '9921', 'M', '3301', '9735', 'B', '4243', 't', 'e', 'I', '459']

Ex Output:

49903