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: ['9125', '1443', '2303', 'O', '8463', '401', '3983', 'g', '4327', 'z', 'n', 'F', 'Q', 'j', '9885']
Example Output: 39930

Example Input: ['9863', 'y']
Example Output: 9863

Example Input: ['2125', '943', 'C', '5663', '3175', '6395']
Example Output:
18301