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: ['5899', '229', 'm', '3347', 'k', 'q', 'g', '2755', '8727', '2035', '823', '6835', '9271', 'Q']

SOLUTION: 39921

PROBLEM: ['J', 'S', 'S', 'U', 'w', '7691', '7529', 'B', '3861', '4557', 'd', '569', '1547']

SOLUTION: 25754

PROBLEM: ['H', '8647', '1699', 'h', '4363', 'F', 'h', '5029', '9679', 'g', 'W', '351', '3641', 'n']

SOLUTION:
33409