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: ['q', 't', '4837', 'F', '2367', '1867', '8361', 'm']

SOLUTION: 17432

PROBLEM: ['6921', 'a', 'U', '2821', '2111', 'h', '3937', '3697', 'd', '6309', 'q', '7961', '5287', '5375', '2721', '4523', 'V', '8633', 'c', '7643']

SOLUTION: 67939

PROBLEM: ['3053', 'h', '7445', 'f', '2613', '7837', 'q', 'J', 'n', 't', 'Q', '2517', '2677', 'Z', 'V', '6665', 'A', '5537']

SOLUTION:
38344