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: ['5215', 'c', '839', 'V']

A: 6054
****
Q: ['4437', '1265', '1519', 'K', 'Q', 'b', 'n', 'J', '6631', 'K', 'q', 'D', 'U', 'u', '3653', '5169', 'L', 's']

A: 22674
****
Q: ['u', '4777', '3747', '4053', 'O', 'u', '4993']

A:
17570
****