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: ['6833', 'R', '7323', 'd', '3487', '8777', '9053', 'y', 'i', 'O', '467', 'b', '5969', 'D', 'B', 'r', '3073', 'i', 't', 'd']

Answer: 44982


Question: ['3331', '5791', 'r', 'Q', '2243', '8229']

Answer: 19594


Question: ['903', '9981', '5269', 'p', '6629', 't', 'q', '7835', '7875', '771', '5447', 'A', 'c', '743', '1837']

Answer:
47290