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: ['D', 'P', 'y', '4891', '1539', 'J', '5737']
Example Output: 12167

Example Input: ['9869', '7701', 'H', 'o', 'v', '1431', 'O', 'L']
Example Output: 19001

Example Input: ['c', '4403', '9407', '6861', '6021', '4099', '8257', '9497', '8433', 'J', 'e', '7501', 't', '2301', '9601', 'v', 'i', '9411']
Example Output:
85792