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', 'A', 'L', 'i', 'I', '3827', '8245', 'H', 'J', '8117', 'w', '4659', 'Y', 'x', 'K']

SOLUTION: 24848

PROBLEM: ['o', 'O', 'H', '7619', '6435', 'X', 'g', '1663']

SOLUTION: 15717

PROBLEM: ['7399', 'P', '4741', '8249', 'm', '319', '2581', '2713', '7709']

SOLUTION:
33711