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.

Q: ['4515', '3911', 'M', 'T', 'w', 'F']

A: 8426
****
Q: ['4241', 'E', '1807', '2877', '5125', '7625', 'S', '401', '5081', 'u', 'R', 'F']

A: 27157
****
Q: ['8007', '2291', 'r', '3383', '7433', 's', 'c', 'b', 'B', '43', '5947', '2821', 'I', '27', '6523', 'd', 'P']

A:
36475
****