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: ['b', 'O', '7023', 'q', '2667', '681', 'C', '5707', '7125', 'q', 'Q', '1375', '8869', '6709']

SOLUTION: 40156

PROBLEM: ['6563', 'R', 'M', 'B', 'b', 'E', '9911', '7327', 'J', '7389', 'w', 'b', 'c', '1527', 'K', 'r', '5441', '6823', '8455']

SOLUTION: 53436

PROBLEM: ['1465', '7527', '8937', '3985', 'Y', '7001', '3335', 'H', 'Y', 'K', 'R', 'l', 'V', '6185', '4703', 'z']

SOLUTION:
43138