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.

['6001', '6423', '5591', '8721', 't', 'x', '3723', 'E', 'F', '7353', 'b']
37812

['w', '1335', 'G', 'h', '6729', '1999', 'u', 'I', 'r', 'm', '4757', 'W', '3715', '701', '1999']
21235

['i', 'q', 'B', 'v', '6081', 'x', '3145', '223', '4499', 'D', 'Z', 'E']

13948