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: ['3683', 'U', 'x', '313', 'n', '3837', '3299', '2081', '2773', 'r', 'O', '257', '6647', '585', 'o']

Answer: 23475


Question: ['w', 'V', '3359', '8847', '7551', '2481', 'Y', 'j', 'L', 'G', '7905', 'v', '4141', '2229', 'k', 'H', '3517', '3885', '3665', 'O']

Answer: 47580


Question: ['l', '5639', 'D', '2753', '4941', 'n', 'N', 's', '199', '9655', '9173', 'g', 'v', 'f']

Answer:
32360