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

Answer: 65415


Question: ['N', 'V', 't', 'X', 't', 'M']

Answer: 0


Question: ['4723', 'Q', 'g', 'X', 'f', '7143', '6591', '4581', '1917', '4393']

Answer:
29348