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: ['8529', '2657', '1599', 'b', '8187', '7005', '7481']

SOLUTION: 35458

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

SOLUTION: 24848

PROBLEM: ['X', '9773', 'd', 'l', '3349', 'u', '8997', '787', '1253', '7219', '8533', 'F']

SOLUTION:
39911