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: ['2151', '7511']
Example Output: 9662

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

Example Input: ['5219', 't', 's', '2295', '4987', 'z', '8663', 'Z', '3043', '513', '1883', 'q', '2857', '3123', 'G', '3989']
Example Output:
36572