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: ['6347', '5495', '169', '9503', 'H', '571', '6105', 'X', 'r', 'e', '7369', 'a', 'd', '6999']

Answer: 42558


Question: ['2729', 'W', 'i', '9073', '343', 'j', '2329', '9159', '4825']

Answer: 28458


Question: ['i', 'J', 'O', 'B', '2931', '5983', '7789', '5145', 'L', '6707', 'm', 'V', 'B', 'U', '1305']

Answer:
29860


