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: ['8591', 'J', 'l', 'l', '7023', 'N', 'n']

SOLUTION: 15614

PROBLEM: ['6255', '8457', 'V', 'z', '4405', 'X', '9267', '5329', 'I']

SOLUTION: 33713

PROBLEM: ['u', '125', '5553', 'J', '4595', 'N', '9217', 'b', 'S']

SOLUTION:
19490