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: ['R', 'C', 'S', 'x', '1529', 'r']

SOLUTION: 1529

PROBLEM: ['v', 'g', '5719', 'F', '7105', 'j', '9147', 'Z', '3961', '8703', '5675', '3195']

SOLUTION:
43505