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.

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

['g', 'h', '9141', '7825', 'a', 'u', '2389', 'r', '9739', '8337', 'Z', 'Z', '6717']
44148

['p', '4991', 'F', '1521', '2363', '5893', 'e', 'a', '8361', 'o', 'U', '695']

23824