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: ['3895', 's', 'j', '7755', 'H', '7941', '4903', 's', '3629', '1183', '1001', '5569', 'q', '4735']
Example Output: 40611

Example Input: ['y', 'F', '135', '7359', '8579', '6809', '3979', 'H', 'm', '5059', '373', 'Y']
Example Output: 32293

Example Input: ['9551', '8253', '6261']
Example Output:
24065