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: ['K', '9121', 'y', '4233', '1513', 'd', '5609', 'C', 'q', 'p', 'S', '627', 'q', 'I']
Example Output: 21103

Example Input: ['I', '1941', '2423', '3381', 'J', '6589', 'h', 'D']
Example Output: 14334

Example Input: ['E', 'Z', '1757', 'o', 'M', 'R', '6985', '4063', 'l', 'C', '7745', 'M', '3905', '5467', 'w', 'p', '3761', '5641', '9509', 'l']
Example Output:
48833