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: ['E', 'X', 'C', 'v', '2803', 'g', 'b', '763']

SOLUTION: 3566

PROBLEM: ['7145', '2895', 'J', 'R', 'X', '29', '7089', '6997', 'N', 'j', '5321', '8501', '5513', 'F']

SOLUTION:
43490