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: ['3433', '6955', 'Q', 'E', '3557', 'S', '2931', '9879', 'S', 'f', 'Q']

SOLUTION: 26755

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

SOLUTION: 27157

PROBLEM: ['b', 'h', '6179', 'V', '7391', 'v', '8601']

SOLUTION:
22171