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: ['a', 'f', '2185', 'N', '6381', '6429', '7499', 'd', '757', 'k', 'k', 'b', 'N', '2697', 'A', '8037']

SOLUTION: 33985

PROBLEM: ['I', '1941', '2423', '3381', 'J', '6589', 'h', 'D']

SOLUTION: 14334

PROBLEM: ['y', '3117', 'g', 'T', 'n', '923']

SOLUTION:
4040