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: ['w', '8035', 'J', '2671', '7509', '1573', '6915', '8569', '345', 'T', 'P', 's', '1341', '7823', '8671', 'm', 'Q', 's', 'N']

SOLUTION: 53452

PROBLEM: ['W', 'O', 'c', 'r', 'E', 'w', '9811', '6421', '3543', '4293', '8255', 't', '229', '745', 'w', 'p', '6861', '5305', 'h']

SOLUTION: 45463

PROBLEM: ['f', '5987', 'n', 'K', '3925', '8921', '2889', '6181', 'z', '4587', 'v', 'q', '1431', 'c', '911', 'w', 'a', '6261', 'x', '8459']

SOLUTION:
49552