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

Answer: 39921


Question: ['R', '9751', '4367', 'l', 'N', '5125', '8751', '7507', 'y', 'K', '6127']

Answer: 41628


Question: ['m', 'i', '5677', 'r', '4391', 'l', 'k', '1883', '9805']

Answer:
21756