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: ['w', '4181', 'g', 'j', '1823', 'q', 'i', '709']

A: 6713
****
Q: ['8871', '1297', 'W', 'f', 'Y', '8731', '113', '6707', '379', '9631', 'X', 'C', 'q']

A: 35729
****
Q: ['K', 'K', 'B', '7651', 'W', '1629']

A:
9280
****