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:
['7087', 'P', 'i', 'e', '4875', 'e', 'F']

Ex Output:
11962


Ex Input:
['v', 't', 'a', 'r', 'O', 'I']

Ex Output:
0


Ex Input:
['x', 'd', '7981', '9461', '25', 'L', 'f', 'm', '5981', '8449', '5379', '3969', '1309', '5623']

Ex Output:

48177