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: ['187', 'J', 'l', 'p', '1009', 'g', '5817', 'V', 'B', 'Z', '3329', '9253']

SOLUTION: 19595

PROBLEM: ['6051', '5303', '1509', '2797', 'Z', '4777', '721', '8563', 'K', '63', '9115', 'd', '7305', '9743', '7409']

SOLUTION: 63356

PROBLEM: ['n', '3177', '9615', 'q', '727', 'V', '9457', '7153', '8227', '3743', '9149', '2951', 'p', 'x', 'N', '2827', 'J']

SOLUTION:
57026