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.

['N', 'e', '4283', '3243', '5581', '1407', 'q', 'y', '6685', 'v', 'c', '5995']
27194

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

['2955', '339', '5655', '1473', '951', 'c', '8109', '2989', 'I', '2289', '4647']

29407