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.
--------
Question: ['4515', '3911', 'M', 'T', 'w', 'F']

Answer: 8426


Question: ['6629', 'o', 'e', '497', '4865', '8733', '5733', '7337', 'N']

Answer: 33794


Question: ['7009', 'k', '4689', '7709', 'T', '1419', '5607', '8359', '7277', 'w', 'B', 'l', 'B', 'Q', '5615', '1607', 'f', '6957', 'D']

Answer:
56248