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: ['3107', 'D', '9595', '8807', 'Q', 'o', 'T', 'N', 'A']
Example Output: 21509

Example Input: ['8669', '9115', '2573', '9261']
Example Output: 29618

Example Input: ['7009', 'S', 'z', 'Z', '745', '9667', 'A', '2585', '9399', '1271', '5249', '3699', 'N', 'H', '9737', 'e', 'G', 'Q']
Example Output:
49361