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: ['9869', '7701', 'H', 'o', 'v', '1431', 'O', 'L']

SOLUTION: 19001

PROBLEM: ['D', '8591', 'b', 'n', 'e', '883', '8923', '245', 'z', '5643', 'C', '2911', '9275', '711', '7299', '3449', '4799', '6065']

SOLUTION: 58794

PROBLEM: ['F', 'o', '1115', 'I', '4357', 'o', 'm', '7541', 's', '7287', 'z', 'a', '897', '7551', 'L', 'W', '2207', '5283']

SOLUTION:
36238