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.
['X', '2137', '3911', 'Y', 'T', 'B', '6009', 'l', '9913', '8149', '5943', '5083', '2523', '7039', 'w', '1901', '6273', 'j', 'v']