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: ['3107', 'D', '9595', '8807', 'Q', 'o', 'T', 'N', 'A']

SOLUTION: 21509

PROBLEM: ['279', '745', 'g', 'k', 'M', '8055', '5675', 'q', 'G', 'Q', 'Q', 'P']

SOLUTION:
14754