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.

['1057', '3937']
4994

['T', 'n', '8513', '5565', '6343', '1403', '975', '6959', '8049', '1601', 'j', 'Q', 'O', '7889', 'r', 'D', '1903', '6607']
55807

['V', '1037', '7857', 'D', '1259', '3403', 'p', '3621', 'v', '9433', '1753', '7209', '2441', 'Z', 'O', '2675', 'I']

40688