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.

['29', 'N', '5061', '7191', 'z', '8367']
20648

['6001', '6423', '5591', '8721', 't', 'x', '3723', 'E', 'F', '7353', 'b']
37812

['Z', 'y', 'P', 'J', '2479', 's', 'e', '231', 'm', '5745', 'g']

8455