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: ['K', '4403', 'a', '3881', '4139', 'w', '1861', 'G']

SOLUTION: 14284

PROBLEM: ['9069', '8333', 'H', '2049', '8051', 'L', '2749', '8819', '2883', '9317', 'M', '6515']

SOLUTION: 57785

PROBLEM: ['7177', '6501', 'E', '5901', '675']

SOLUTION:
20254