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

SOLUTION: 33713

PROBLEM: ['Y', 'X', 'd', 'N', '1877', '2865', 'M', '1249', '9385', 'v', 'o', 'P', 'P', '6029']

SOLUTION: 21405

PROBLEM: ['2051', '8839', '4493', '2285', '7515', '2613', 'C', '735', '8449', 'n', '8691']

SOLUTION:
45671