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', 'G', '5059', '8343', '8673', 'P', 'N', '5485', '2279', '6121', 'i', 'U', '7277', '8701', 'A', 'b', 'Z', 'R', '6371', 'G']
58309

['433', 'y', '2015', '5997', 'X', 'u', '9321', '8037', 'N', 'Z', 'E', '4645', '627', '6595', '7679']
45349

['t', '339', '5959', '7203', 'A', 'B', '9627', 'b', 'F', '5279', 'R']

28407