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: ['N', 'e', '4283', '3243', '5581', '1407', 'q', 'y', '6685', 'v', 'c', '5995']

SOLUTION: 27194

PROBLEM: ['6731', 'f', '4561', '5601', 'i']

SOLUTION: 16893

PROBLEM: ['Z', '9959', '3555', 'Z', 'E', '7381', '2487', '5623', 'z', '815', '2211', 'V', '9869', '723']

SOLUTION:
42623