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: ['h', 'a', '1645', '2391', '759', '519', '3331', '2831', '3427', '9893', 'u', 'J', '7391', '8379', 'V']

SOLUTION: 40566

PROBLEM: ['9403', 'u', '4159', 'w', '3467']

SOLUTION: 17029

PROBLEM: ['9193', '1601', '809', 'u', 'z', '8217', '6247', 'a', 'F', 'E', '2915']

SOLUTION:
28982