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.

['2915', '4443', 'Z', '3409', '1417', 'H', 'T', 'u', '3373', 'U', '115', 'R']
15672

['D', '9679', 'e', '5537', 'G', 'l', '2653', 'a', 'Y', '8467', 'q', 'L', '7239', 'O']
33575

['3083', '8977', '6783', '299', '3581', '5095', '3797', 'p', '2181', 'h', '7021', '1653']

42470