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: ['4515', '3911', 'M', 'T', 'w', 'F']

SOLUTION: 8426

PROBLEM: ['2237', '2597', '2593', 'Y', '5345', 'g', 'l', 'I', 'p', 'u', 'L', 'T', '617', '9759', 'b', 'w', '7097', '9863']

SOLUTION: 40108

PROBLEM: ['K', 'z', '5715', 'q', '9813', 'B', 't', 'v', 'm', 'r', 'p', 'a', '2615', '8825', '4175']

SOLUTION:
31143