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.

['8529', '2657', '1599', 'b', '8187', '7005', '7481']
35458

['a', 'q', '4085', '6327', '6869', 'Z', 't', '7057', '1965', 'p', 'o']
26303

['5823', '5737', 'n', '1829', '4415']

17804