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.

['4515', '3911', 'M', 'T', 'w', 'F']
8426

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

['j', 'I', 'd', 'C', '8903', 'v']

8903