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

['W', 'c', 'P', '425', '4133', 's', '1831', '883', '2531', '681', 'U', 'B', 'H', '237', '4245']
14966

['2681', 'W', 'Y', 'K', '4059', '9427', '4267', '4105']

24539