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: ['4201', '6445', '4009', 'q']
Example Output: 14655

Example Input: ['887', '8133', 'X', '2253', '8461', 'I', '5425', 'Z', 'z', 'r']
Example Output: 25159

Example Input: ['u', '6743', 'z', '5621', '4117', 'r', '8265', 'j', '4087', 'd', 'u']
Example Output:
28833