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: ['7465', 'G', '105', 'A', '3987', 'O', '7385', 'C', '8957']

Answer: 27899


Question: ['8821', '7221']

Answer: 16042


Question: ['F', '8491', 'X', 'C', 'Y', 'H', '7215']

Answer:
15706