TASK DEFINITION: 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.
PROBLEM: ['V', 'O', '1309', 'm', '9333', '8283', 'Z', 'K', 'X', 'w', '9855', '9075', '2013', '8485', '9973', '8779']

SOLUTION: 67105

PROBLEM: ['t', 'v', 'B', 'Y']

SOLUTION: 0

PROBLEM: ['299', 'N', 'Y', 'a', '207', 'l', 'c', '4465', 'N', '9293', 'e', '3781', 'g', '8909', '8371']

SOLUTION:
35325