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: ['Y', '8169', '9067']
Example Output: 17236

Example Input: ['8361', '6757', '5341', '2597', '9803', 'a', 'd', '5889', '9823', 'd', '7947', 'y', 'p']
Example Output: 56518

Example Input: ['8065', '6571', 'E', '1163', 'P', 'I', 'B', '4415', '245', 'c']
Example Output:
20459