You will be given a definition of a task first, then some input of the task.
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.

['Z', '9959', '3555', 'Z', 'E', '7381', '2487', '5623', 'z', '815', '2211', 'V', '9869', '723']
Output:
42623