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.

Ex Input:
['2923', '3573', '6179', '7673', '6551', 'B', '315', '5169', 'm', '9405', 'm', 'Z']

Ex Output:
41788


Ex Input:
['6551', 'm', '3941', 'F', 'K', 'u', '7981', '9581', 'X', 'M', 'N', 'e', 'G', 'i']

Ex Output:
28054


Ex Input:
['3957', '2291', 'U', '3053', 'D', '8505', '8675', '8045', 'r', '4453', '3231', 'w']

Ex Output:

42210