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: ['u', 'e', 'P', 'D', '255', '2573', 'E', 'P', 's', '3725', '3391', 'I', '5323', '885']

SOLUTION: 16152

PROBLEM: ['K', '9121', 'y', '4233', '1513', 'd', '5609', 'C', 'q', 'p', 'S', '627', 'q', 'I']

SOLUTION: 21103

PROBLEM: ['G', '8659', '8601', 'k', '6273', '4725', '5983', 'w']

SOLUTION:
34241