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: ['h', '9539', '3373']

Answer: 12912


Question: ['8821', '7221']

Answer: 16042


Question: ['X', '6695', '2057', '1155', 'U', '4039', '3457', '1789', 'j', '6625', '5503', 'j', '2007']

Answer:
33327