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: ['A', 'S', 'c', 'I', 'M', 'P', '8739', '879', '1401', '3941', '4061', 'q', 'P', '2805', '4473']

SOLUTION: 26299

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

SOLUTION: 32029

PROBLEM: ['3007', 'f']

SOLUTION:
3007