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: ['y', 'F', '135', '7359', '8579', '6809', '3979', 'H', 'm', '5059', '373', 'Y']

Answer: 32293


Question: ['X', '6189', '5435', 'y', '8931', '8987', 'F', '8377', 'k', '8631', '8717', 'q', '2923', 'g', '7225', 'j']

Answer: 65415


Question: ['R', '267', '705', '4705', '1195', '8493', '1705', 's', '5533', 'B', '419', '1867', '6905']

Answer:
31794