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: ['2975', '33', '2845', '4695', 'j', '607', 'e', 'z', '6339', '1899', 'q', 'O']

SOLUTION: 19393

PROBLEM: ['3629', '8785', '9537', '8479', '3523', 'c', 'C', '5093', '2405', 'y', '1145', '8987', 'f']

SOLUTION: 51583

PROBLEM: ['X', '8529', 'S', 'P', 'h', 'R', 'j', '9617', '9003', '7855']

SOLUTION:
35004