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: ['1815', 'U', '869', 's', '1847', 'C', '2711', 'S', 'i', '7949', '4477', '5093', 'D', '8661', '3835', '4087', '73', 'V', '3149', 's']

Answer: 44566


Question: ['l', 'B', 'Y', '7543', '5091', '1917']

Answer: 14551


Question: ['O', 'K', '9049', 'W', '8941', '4977', '5493', 'u']

Answer:
28460