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.

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

A: 12346
****
Q: ['w', '4181', 'g', 'j', '1823', 'q', 'i', '709']

A: 6713
****
Q: ['7631', '3053', '3107', '2037']

A:
15828
****