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', 'a', 'O', 'S', 'r', 'T', 'r', 'K', 'K', '7781', '1749']
Example Output: 9530

Example Input: ['b', 'W', 'V', 'R', '3761', 'U', '4553', '1803', 'W', '7775', '1067', 'Y', 'D', '3159']
Example Output: 22118

Example Input: ['p', '223', '6411', '9435', '5583', 'G', 'p', 'G']
Example Output:
21652