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

['B', 'u', '9227', 'b', '8767']
17994

['7465', 'G', '105', 'A', '3987', 'O', '7385', 'C', '8957']

27899