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.

['Q', '1767', '5523', 'I', '933', 'h', '2189', 'f', '7795', 'X', 'M', 'G', '1215', 'W', '8619']
28041

['6577', 'Q', '6865', '7671', 'N']
21113

['u', 'B', '2509', 'U', 'R', '7497', '1897', '8697', 't', 'W', '1021', '7937', 'F', 'g', '6901', 'I', '2957']

39416