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: ['b', 's', 'v', '4757', '9063', 'I', '8397', '7975', 'Q']
Example Output: 30192

Example Input: ['Q', '2271', '1803', '2363']
Example Output: 6437

Example Input: ['5459', '8401', 'C']
Example Output:
13860