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: ['X', '6189', '5435', 'y', '8931', '8987', 'F', '8377', 'k', '8631', '8717', 'q', '2923', 'g', '7225', 'j']
Example Output: 65415

Example Input: ['3215', 'h', '9133', '2771', 'F', 'x', '9033', '709', 'q']
Example Output: 24861

Example Input: ['5221', '8395', '6977', 'e', '2171', '9015', 'a', 'n', 't', '5363', '6083', 'v']
Example Output:
43225