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: ['9787', '1491', '4411', '5261', 'U', '9787', 'b']
Example Output: 30737

Example Input: ['95', '279', 'y', 'p', '5083', 'X', 'E', '3817']
Example Output: 9274

Example Input: ['8787', '5891', 'e', '8525', 'f', '7383', 'e', 'j', '8535', 'h', 'u', 'E', '3755']
Example Output:
42876