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: ['8809', '4559', '2715', 'w', '9903', 'h', 'u', 'F', '9369', '6149']

Answer: 41504


Question: ['L', 'w', '2783', '6993', 'd', '9173']

Answer: 18949


Question: ['5087', 'L', '1027', '2121', 'x', '3113', '6581', 'd', '1323', 'I', 'C', '1487']

Answer:
20739