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: ['3145', 'C', '7725', 'k', 'z']

Answer: 10870


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

Answer: 65415


Question: ['J', '3129', 'l', '935', 'w', 'G', 'D', 'X', '5449', '3835', '9733', '6549', 'v', '7661', 'Y', 'L', 'h', 'Y', '881']

Answer:
38172