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', 'g', 'Z', '8919', 'R']
8919

['q', '6631', 'b', '4207', '7523', '9853', '9203', 'P', '5029', 'b', '2319', '4717', '2485']
51967

['6991', 'p', 'J', '4283', '9185', 'Y', 'J', '3053', 'J', '7281', '3547', '6003', '8129', 'N', 'X', '2925']

51397