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.

['i', 'w', '8117', '2823', 'C', 'x', 'w', '5959', 'g', 'e', 'L', 'V', 'i', 'w', 'n']
16899

['k', 'Z', 'r', 'K', 'b', 'X', 'A']
0

['6983', 'K', '3525']

10508