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.

Example Input: ['7459', '491', '7823', '6965', 'H', '109', 'R', 't', '3959', '2821', 'R', '2807', 'o', 'v', '1305', 'a', '1411', 'r', '3669']
Example Output: 38819

Example Input: ['83', 'k', 'p', 'o', 'b', '7819', '2089', '4141', 'c', 's', '6045', '6783', 'J', 'B', 'x', 'O', 'X', '9693']
Example Output: 36653

Example Input: ['4055', 's', '4509', '9257', '797', '775', '9617', '2829', 'J', 'q', '447', '5843', 't', '2219']
Example Output:
40348