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: ['u', 'i', 'z', 't', '9617', 'd', '3255', 'w', 'S', '3041', '7451']
Example Output: 23364

Example Input: ['q', '867', 'e', 'z']
Example Output: 867

Example Input: ['1055', 'i', '8787', 'H', 'K', '9065', '8499', 'l', 'r', 'm', 'd', '8937', 'z', '1399', '8429', 'w', 'L', '8323', 'Q']
Example Output:
54494