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.

['8683', 'p', '47', '8983', 'g', 'u']
17713

['4685', 'q', 'O', 'o', '3453', 'o', 'Y', 'C', 'a', 'i', '7283', 'J', 'n', 'Q', 'i']
15421

['j', 'H', 'g', '7135', 'm', '8045']

15180