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: ['J', '5149', 'H', 'L', 'm', 'h', '3863', 'n', 'z']

SOLUTION: 9012

PROBLEM: ['1493', 'x', 'h', '31', '3327', '1621', '4529', 'd', '377', 'R', 'X', 'Z', 'G']

SOLUTION: 11378

PROBLEM: ['4781', '9203', '2367', '8509', 'S', '367', 'L', 'q', 'I', 'g', '2087', '6125', 'X', 'r', '3943', 'D', 'v', 'Q']

SOLUTION:
37382