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: ['s', 'd', 't', '8235', '2279', '7477', '3029', '4377', '9153', '4309', '2295', '407']

SOLUTION: 41561

PROBLEM: ['w', '4181', 'g', 'j', '1823', 'q', 'i', '709']

SOLUTION: 6713

PROBLEM: ['6325', 's', 'G', 'K', 'b', '2155', 'D', 'b', '861']

SOLUTION:
9341