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: ['Q', '1669']

Answer: 1669


Question: ['O', '6337', 'j', '6009', 'z']

Answer: 12346


Question: ['e', 'y', '5551', 'Y', 'e', '2921']

Answer:
8472