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: ['j', 'R', '2435']

Answer: 2435


Question: ['83', 'k', 'p', 'o', 'b', '7819', '2089', '4141', 'c', 's', '6045', '6783', 'J', 'B', 'x', 'O', 'X', '9693']

Answer: 36653


Question: ['1793', '3083', 'K', 'h', '9405', 't', '3487', '9059', 'w']

Answer:
26827