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: ['Y', '8169', '9067']

SOLUTION: 17236

PROBLEM: ['L', 'i', '9225', 'w', '5365', '8077', '2733', 'W', '8493', 'B']

SOLUTION: 33893

PROBLEM: ['W', '2861', 'q', 'D', 'd', 'Q', '4495', 'r', 'W', 'W', '7417']

SOLUTION:
14773