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: ['m', '6153', 'A', '6173', 'x', '7527', '8501', 'g', 'r', 'K', 'I', '3103', '8347']
Example Output: 39804

Example Input: ['R', '9751', '4367', 'l', 'N', '5125', '8751', '7507', 'y', 'K', '6127']
Example Output: 41628

Example Input: ['9075', 'F', 'e', 'A', '5011', '4191', '5451', '915', '9159', '9137', '3965', '1593', 'x', 'x', 'p', 'g']
Example Output:
48497