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: ['Z', '6245', 'N', '1403', 'b']

SOLUTION: 7648

PROBLEM: ['q', 'U', 'I', '5245', 'g', 'Y', 's', 'V', 'b', 'V', 'D', '1193', 'p']

SOLUTION: 6438

PROBLEM: ['t', 'D', 'Z', '3119', 'e', '6991', 'x', 'V', 'u', '3433', '8225']

SOLUTION:
21768