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: ['l', 'B', 'Y', '7543', '5091', '1917']

SOLUTION: 14551

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

SOLUTION: 16899

PROBLEM: ['7131', 'L', '6773', '7789', 'N', '9201', 'h', '5589', 'c', 'c', 'O', 'e']

SOLUTION:
36483