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: ['e', 'K', 'A', 'V', '1169', 'n', '8729', 'V']

Answer: 9898


Question: ['W', '4453', '5895', 'Z', 'A', '7663', '2749', 'f', 'H', '6917', '1215', 'M', '1775', '5397', 'l', '8197', '5209', '8229', 'U']

Answer: 57699


Question: ['u', 'T', 'j', '4939', '5219', '3735', 'Y', 'r', 'a', '7235', '4185', 'K', 'u']

Answer:
25313