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.

['9403', 'u', '4159', 'w', '3467']
17029

['q', '867', 'e', 'z']
867

['E', '7545', '19', '9853', 'c', 'D', 'w', 'a', 'n']

17417