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: ['4529', '7465', 'S', 'Z', 'v', 'w', '5791', '3363', '2643']
Example Output: 23791

Example Input: ['6121', 'S', '8683', 'Y', '6107', 'B', '6193', '5555', '365', '945', '1439', '7257', 'g']
Example Output: 42665

Example Input: ['9755', '811', '1451', 'W', '4793', '7345', 'd', 'M', 'f', '483']
Example Output:
24638