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: ['6723', '1', '6357', '1497', 'A', 'p', 'N', 'T']

Answer: 14578


Question: ['i', 'A', 'a']

Answer: 0


Question: ['4693', 'Y', 'u', 'g', '9935', '6995', 'k', 'V', 'B', '3215', '5835', 'n', 'C', 'A', '2047', 'R', 'K', '5611', 'E']

Answer:
38331