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: ['5467', '3013', '8325', '4005', 'J', 'V', '395', '7477', 'E', 's', '1337', 'g', 'v', '8569', '9757', 'x', '3909', '2983', 's', '7917']

SOLUTION: 63154

PROBLEM: ['s', '425', '6135']

SOLUTION: 6560

PROBLEM: ['5331', 'f', '2865', '6019', 'U', 'm', 'g', 'n', 'Y', 'A']

SOLUTION:
14215