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: ['89', '5965', '9463', 'k']

Answer: 15517


Question: ['6165', 'x', 'u', 'n', 'V', 'B', '4039', 'l', '991', 'x', '335', '9011', 'K', '8725', 'a', '6291', 'j']

Answer: 35557


Question: ['h', '8641', '399', 'R', 'j', 'z', '1909', '6281', 'u', 'I', '3895', '6243', '1701', 'J', '5473']

Answer:
34542