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: ['v', '9511', 'f', 'q']
Example Output: 9511

Example Input: ['2691', '3861', '7087', '4661', '6527']
Example Output: 24827

Example Input: ['B', '8669', 'f', 'K', '2389', '2405', 'D', '6151', 'x', '8733', '5665', '1707', 'V']
Example Output:
35719