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: ['g', 'A', 'r', '539', '5459', '2725', '7447', '3693', '1757', 'r', 'W', '5949', '4569', '5153', '3985', 'Q', '505', 'M', '8989']

Answer: 50770


Question: ['7771', 'g']

Answer: 7771


Question: ['2433', 'b', 'h', 'B', 'W', '8171', 'y', '7739', '3523', '7487', '2757', '2599', '1693', '1205']

Answer:
37607