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:
['T', 'n', '8513', '5565', '6343', '1403', '975', '6959', '8049', '1601', 'j', 'Q', 'O', '7889', 'r', 'D', '1903', '6607']

Ex Output:
55807


Ex Input:
['8109', '5635', 'u', 'M', '1009']

Ex Output:
14753


Ex Input:
['9329', '2393', 'D', '3845', '3971', '7879', 'p']

Ex Output:

27417