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

['4533', 'D', '823', 'a', 'x', 'p', '9787', '2587', 'T', 'Z', '2207', '8719', 'F', '7675', 'T', '2777', '203', 'N', 'o']
39311

['S', 'L', 'J', '1027', 'I', 'h', 'H', '6835', 'w', 'a', '3155', '7749', 'X', '8627', 'm']

27393