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: ['6255', '8457', 'V', 'z', '4405', 'X', '9267', '5329', 'I']
Example Output: 33713

Example Input: ['r', 'B', '8791', '3165', 'n', 'm']
Example Output: 11956

Example Input: ['9165', '1717', 'J', '9283', '6317', 'K', '8003', '1955', '4825', '137']
Example Output:
41402