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: ['f', 'F', 'E', '2279', 'r', '6419', 'd', 'M', '3975', '3797', '9201', 'F', 'c', '4753', '959', 'v', '8963', '4007']

SOLUTION: 44353

PROBLEM: ['2729', 'W', 'i', '9073', '343', 'j', '2329', '9159', '4825']

SOLUTION: 28458

PROBLEM: ['8815', '8249', '3803', 'v', 'm', '6387', '3271', 'l', '3601', '5869', '7557', '9859']

SOLUTION:
57411