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: ['4161', 'E']

SOLUTION: 4161

PROBLEM: ['2577', 'B', '3059', 'S', 'l', 'T', 'Q', 'x', 'f', 'l', 'y']

SOLUTION: 5636

PROBLEM: ['e', '8511', '8863', 'r', '3109', '4711', 'a', '3537']

SOLUTION:
28731