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.

['y', 'p', '3553', '2155', 'b', 'R', 'j', 'V', 'U']
5708

['w', 'I', 't', '813', 'K', '5785']
6598

['519', '8903', 'S', '4261', '7577', 'i', 'O', '7347', '5053', 'z', 'A', '3493', '2229', '5151']

44533