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: ['z', '3199', 'r', '849', 'C', 'v', '1931', 'M', 'Q', '4531', '579', 'x', '8997', '4663']

SOLUTION: 24749

PROBLEM: ['29', 'N', '5061', '7191', 'z', '8367']

SOLUTION: 20648

PROBLEM: ['6659', 'c', 'C', 'm', '8641', '1067', '9861', 'V', 'J', 'R', '5243', 'W', 'B', 'P']

SOLUTION:
31471