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: ['A', 'S', 'c', 'I', 'M', 'P', '8739', '879', '1401', '3941', '4061', 'q', 'P', '2805', '4473']
Example Output: 26299

Example Input: ['6585', '5263', '9497', '1117', 'a', 'F', 'w', '6595', '547']
Example Output: 29604

Example Input: ['E', '363', 'T', 'k', '7837', 'o', '6779', 'X', 'Y', 'Z', 'o', '61', '439', '2285', 'H']
Example Output:
17764