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: ['w', 'I', 't', '813', 'K', '5785']

Answer: 6598


Question: ['6921', 'a', 'U', '2821', '2111', 'h', '3937', '3697', 'd', '6309', 'q', '7961', '5287', '5375', '2721', '4523', 'V', '8633', 'c', '7643']

Answer: 67939


Question: ['8699', 's', '5831', '8421', '9871', '3673', '351', '9301', '2617', '7343', 'n', 'G', 'q', '7835', '1169', '9597', '959']

Answer:
75667