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: ['2923', '3573', '6179', '7673', '6551', 'B', '315', '5169', 'm', '9405', 'm', 'Z']

SOLUTION: 41788

PROBLEM: ['3705', '9217', 'C', '4609']

SOLUTION: 17531

PROBLEM: ['5595', 'b', '8093', 'm', 'Z', 'X', 'k', '3709', 'K', 'a', 'g', 'g', 'a', '4889', '9675', 'k', 'O', 'g', '4025']

SOLUTION:
35986