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: ['6001', '6423', '5591', '8721', 't', 'x', '3723', 'E', 'F', '7353', 'b']

SOLUTION: 37812

PROBLEM: ['2485', 'Q', 'G', '5533', 'Y', '21', 'D', 'S']

SOLUTION: 8039

PROBLEM: ['K', 'X', 'S', '5899', '2991', 'w', '9703', '7615', '5145', 'H', '7483', '4935']

SOLUTION:
43771

