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: ['597', 'i', 'd', '3201', 'u', '1111', '8563', 'c', 'E', '5983', '6293']
Example Output: 25748

Example Input: ['6347', '5495', '169', '9503', 'H', '571', '6105', 'X', 'r', 'e', '7369', 'a', 'd', '6999']
Example Output: 42558

Example Input: ['e', 'j', '6813', 'g', 'I', 'W', 'N', 'u', 'd', 'V']
Example Output:
6813