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: ['6723', '1', '6357', '1497', 'A', 'p', 'N', 'T']

SOLUTION: 14578

PROBLEM: ['8809', '4559', '2715', 'w', '9903', 'h', 'u', 'F', '9369', '6149']

SOLUTION: 41504

PROBLEM: ['29', 'N', '5061', '7191', 'z', '8367']

SOLUTION:
20648