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: ['4685', 'q', 'O', 'o', '3453', 'o', 'Y', 'C', 'a', 'i', '7283', 'J', 'n', 'Q', 'i']

SOLUTION: 15421

PROBLEM: ['4529', '7465', 'S', 'Z', 'v', 'w', '5791', '3363', '2643']

SOLUTION: 23791

PROBLEM: ['N', 'i', 'o', 'f', 't', 'w', '9443', 'a', '9845', 'w', 'f', 'Q', '9395', '7933', '9683', 's', '4759', 'o', 'D']

SOLUTION:
51058