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: ['6019', '1467', '3415', '7785']
Example Output: 18686

Example Input: ['d', 'C', '4625', 'T', 'Q', '2091', '1589', 'e', 'z', 'k', '813', 'H', 'G']
Example Output:
9118