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.

['s', '407', '7983', '1523', '8983', '9841', 'p', 'y', 'N', '7633', 'T', '4177', 'Z', 'Y', '3223', '7125', '2601', '7467', '3039']
64002

['5289', '1701', '5925', '7973', 'F', 'V', 'y', '5903', 'i']
26791

['9047', 'S', 'W', '6323', 'j', 'Z', 'W']

15370