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.

['6121', 'S', '8683', 'Y', '6107', 'B', '6193', '5555', '365', '945', '1439', '7257', 'g']
42665

['D', 'P', '9951', '2897', 'V', 'C', 'B', 'H', 'c', 'h', '2843', 'a']
15691

['451', 'v', 'l', 'E', '3223', 'O', '6025', '6899', '993', '6261', '297']

24149