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: ['7379', 'I', '2031', '8419', 'w', 'b', '9827', 'X', 'Y', 't', '3789', 'B', 'c', '6599', 'F', '6169', 'V']

SOLUTION: 44213

PROBLEM: ['i', 'w', '8117', '2823', 'C', 'x', 'w', '5959', 'g', 'e', 'L', 'V', 'i', 'w', 'n']

SOLUTION: 16899

PROBLEM: ['4833', '9287', '645', 'w', '4411', '9437', 'X', 'M', '8189', 'H', '7581', '6909', '3319', 's', 'O']

SOLUTION:
54611