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.

['D', '1693', 'f', 'B', 'o', '3947', '8667', 'f', '6721', '4191', '79']
25298

['S', '1249', '6233', 'I', '6733', 'r', 'A', 'E', 'h', 'x', 'p', 'c', '515', '1029', '1593', '1035']
18387

['G', 'o', 'g', 'I', 'S', '9193', 'G', 'C', '2481', '435', 'm', '1005', '5605', '6501', 'D']

25220