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: ['8809', '4559', '2715', 'w', '9903', 'h', 'u', 'F', '9369', '6149']

SOLUTION: 41504

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

SOLUTION: 16899

PROBLEM: ['h', '7877', 'B', 't', '9029', '2907', 'x', '1969', '2417', '9323', '9799', 'u', 'i', '3897', 'B', '3667', 'a']

SOLUTION:
50885