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: ['s', 't', 'W', '163', 'v']

SOLUTION: 163

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

SOLUTION: 39921

PROBLEM: ['j', '9339', 'J', '415', '7755', 'A', '805', 'l', 'm', '8157', '4481', 'F', 'W', 'f', 'n', 'z', '1873']

SOLUTION:
32825