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: ['8667', '4129', '7075', '6345', '1315', 'M', 'F', '9073']
Example Output: 36604

Example Input: ['h', 'a', '1645', '2391', '759', '519', '3331', '2831', '3427', '9893', 'u', 'J', '7391', '8379', 'V']
Example Output: 40566

Example Input: ['733', '4655', '2489', '8573', 'd', '6931', 'C', 'L', '1671', '1119']
Example Output:
26171