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: ['6577', 'Q', '6865', '7671', 'N']

Answer: 21113


Question: ['X', 'f', 'q', '4665', '1853', '7613', '4137', 'x', 'P', '1693', 'J', '7599', '5687', 'u', '3809', '4723', '3935', 'M']

Answer:
45714