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: ['4145', 't']

Answer: 4145


Question: ['8591', 'J', 'l', 'l', '7023', 'N', 'n']

Answer: 15614


Question: ['5705', '5395', '4829', 'A', '1485', 'H', '9477', '711', '7139']

Answer:
34741