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: ['D', 'P', '9951', '2897', 'V', 'C', 'B', 'H', 'c', 'h', '2843', 'a']

Answer: 15691


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

Answer: 0


Question: ['d', '1753', 'k', '8203', 'H', '7335', '4855', '3511', 'E', 'd', 'Y', '5429', 'm', '5681', 'E', '2307', 'S', 'g']

Answer:
39074