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: ['8743', 'Y', 'O', '8265', '1029', '5689', 'F', 'j', 'Z', 'i', 'S', '1285', '737']

SOLUTION: 25748

PROBLEM: ['6469', '3027', 'Z', '3353', 'a', 'S', '3879', '8471', 'H', 'I', 'y', '2661', '9007', 'D']

SOLUTION: 36867

PROBLEM: ['F', '1303', '1039', '9111', 'n', '309', 'r', '5469', '2917', 'Q']

SOLUTION:
20148