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: ['1001', 'T', 'w', 'f', 'Q', '4035', 'b', 'q', 'x', 'R']

SOLUTION: 5036

PROBLEM: ['4241', 'E', '1807', '2877', '5125', '7625', 'S', '401', '5081', 'u', 'R', 'F']

SOLUTION: 27157

PROBLEM: ['71', '5107', 'f', '9173']

SOLUTION:
14351