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: ['i', 'A', 'a']

SOLUTION: 0

PROBLEM: ['4089', '2385', 'E', 'K', '259', '295', '6649', '8645', 'n', '2577', '2683', '9041', 'Q', 'm', '4237']

SOLUTION: 40860

PROBLEM: ['5007', 'w', '3335', '9039', '6155', '8971', 'u', '4179', 'Q', '3337', '1075', '1407', 'L', '3709']

SOLUTION:
46214