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: ['t', '7015', '2239', 'I', 'F', 'E', '1363', '9615', '6179', '2539', 'z', '8745', '1319', '4715', '9071', 'K', '3707', '6149', 'd']

SOLUTION: 62656

PROBLEM: ['2787', 'z', '9351', '3339']

SOLUTION: 15477

PROBLEM: ['8397', 'H', 'k', '441', '2017', '5121', 'h', 'F', 's', 'T', 'H', 'i', '2747', '2625', 'f', 't', 'F', '8369']

SOLUTION:
29717