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: ['3575', '8877', '3231', 'v', '9083', '317', 'M', '8975', 'x', 'F']
Example Output: 34058

Example Input: ['X', 'u', 'B', '269', '9089', 'M', '5175', 'K']
Example Output: 14533

Example Input: ['H', 'f', '63', '1681', '4543', 'e', 'q', 'M', 'N', '8797', '2567', 'T', '3225', 'g', '745']
Example Output:
21621