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: ['2975', '33', '2845', '4695', 'j', '607', 'e', 'z', '6339', '1899', 'q', 'O']

Answer: 19393


Question: ['2923', '3573', '6179', '7673', '6551', 'B', '315', '5169', 'm', '9405', 'm', 'Z']

Answer: 41788


Question: ['9407', '8413', '9925', '9051', 'w', 'J', 'l', '6909', '5697', 'O', 'n', 'N', '7439', 'u']

Answer:
56841