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: ['e', '9777', '1835', 'N', '2425', '1427', 'o', '4459', '9961', '3285', '5199', 'x', 'e', '7727']
Example Output: 46095

Example Input: ['2765', '6767', '7645']
Example Output: 17177

Example Input: ['e', 'i', '5891', '3967', '4781']
Example Output:
14639