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: ['6723', '1', '6357', '1497', 'A', 'p', 'N', 'T']

SOLUTION: 14578

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

SOLUTION: 3566

PROBLEM: ['Z', 'w', 'V', '1493', '7291', 'l', '5333']

SOLUTION:
14117