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: ['6565', 'T', 'O', '2901', '5121', 'y', '9617', 't', '7825']

SOLUTION: 32029

PROBLEM: ['g', 'h', '9141', '7825', 'a', 'u', '2389', 'r', '9739', '8337', 'Z', 'Z', '6717']

SOLUTION: 44148

PROBLEM: ['4367', 'L', '9301', '4585', 'a', 'W', 'W', '3761']

SOLUTION:
22014