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: ['w', 'I', 't', '813', 'K', '5785']

SOLUTION: 6598

PROBLEM: ['6515', '5525', 'o', 'Q', '9049', 'f', 'p', 'X', '2057', 'h', '7585', '3617', '7817']

SOLUTION: 42165

PROBLEM: ['6563', 'F', 'J', 'q', '969', 'H', '2649', 'o', 'i', 'k', 'y', 'I', '3071', 'v', '1341', '9439', 'K', 'P', '1773', '3609']

SOLUTION:
29414