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: ['Y', '263', '641', '1163', 'p', 'r', 'L', '4425', 'C', '7585']

Answer: 14077


Question: ['4685', 'q', 'O', 'o', '3453', 'o', 'Y', 'C', 'a', 'i', '7283', 'J', 'n', 'Q', 'i']

Answer: 15421


Question: ['l', '779', '817', 'q', 'V', '6897']

Answer:
8493